12th Class Biology Principle Of Inheritance And Variation Question Bank

done MCQs - Principles of Inheritance and Variation Total Questions - 195

• question_answer1)
  Two crosses between the same pair of genotypes of phenotypes in which the sources of the gametes are reversed in one cross is known as:
  A)
  Test cross done clear
  B)
  Dihybrid cross done clear
  C)
  Reverse cross done clear
  D)
  Reciprocal cross done clear
  View Solution play_arrow

• question_answer2)
  The total number of progenies obtained through dihybrid cross of Mendel is 1280 in F2 generation. How many are recombinants?
  A)
  240 done clear
  B)
  360 done clear
  C)
  480 done clear
  D)
  720 done clear
  View Solution play_arrow

• question_answer3)

  What is shown in the following figure?

  A)
  Steps in making a selfing in a pea plant done clear
  B)
  Steps in making a cross in a lotus plant done clear
  C)
  Steps in making a cross in a pea plant done clear
  D)
  Steps in making a cross in a rose plant done clear
  View Solution play_arrow

• question_answer4)
  In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the \[{{F}_{2}}\] generation of the cross \[RRYY\text{ }\times \text{ }rryy\text{ }?\]
  A)
  Only round seeds with green cotyledon done clear
  B)
  Only wrinkled seeds with yellow cotyledons done clear
  C)
  Only wrinkled seeds with green cotyledons done clear
  D)
  Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons done clear
  View Solution play_arrow

• question_answer5)
  How many different kinds of gametes will be produced by a plant having the genotype AA Bb CC ?
  A)
  Three done clear
  B)
  Four done clear
  C)
  Nine done clear
  D)
  Two done clear
  View Solution play_arrow

• question_answer6)
  The possible blood group of children born to parents having A and AB groups are :
  A)
  0, A done clear
  B)
  A, B, AB done clear
  C)
  0, A, B done clear
  D)
  0, A, B, AB done clear
  View Solution play_arrow

• question_answer7)
  In Mirabilis jalapa, the number of \[{{F}_{2}}\] red flowered plants in a cross of red flowered x white flowered would be :
  A)
  1 done clear
  B)
  2 done clear
  C)
  3 done clear
  D)
  4 done clear
  View Solution play_arrow

• question_answer8)

  What type of cross is shown in the following figure?

  A)
  Diagrammatic representation of dihybrid cross done clear
  B)
  Diagrammatic representation of trihybrid cross done clear
  C)
  Diagrammatic representation of monohybrid cross done clear
  D)
  Diagrammatic representation of test cross done clear
  View Solution play_arrow

• question_answer9)
  A common test to find the genotype of a hybrid is by :
  A)
  Crossing of one \[{{F}_{2}}\] progeny with female parent done clear
  B)
  Studying of sexual behaviour of \[{{F}_{1}}\] progenies done clear
  C)
  Crossing of one \[{{F}_{1}}\] progeny with male parent done clear
  D)
  Crossing of one \[{{F}_{2}}\] progeny with male parent done clear
  View Solution play_arrow

• question_answer10)
  One of the parents of a cross has mutation in its mitochondria. In that cross, the parent is taken as male. During segregation of \[{{F}_{2}}\] progenies that mutation is found in :
  A)
  One third of the progenies done clear
  B)
  None of the progenies done clear
  C)
  All of the progenies done clear
  D)
  Fifty per cent of the progenies done clear
  View Solution play_arrow

• question_answer11)
  In the ABO system of blood groups, if both antigens are present but no antibody, the blood group the individual would be :
  A)
  B done clear
  B)
  0 done clear
  C)
  AB done clear
  D)
  A done clear
  View Solution play_arrow

• question_answer12)
  Extranuclear inheritance is a consequence of presence of genes in :
  A)
  Mitochondria and chloroplasts done clear
  B)
  Endoplasmic reticulum and mitochondria done clear
  C)
  Ribosomes and chloroplasts done clear
  D)
  Lysosomes and ribosomes done clear
  View Solution play_arrow

• question_answer13)
  Which one of the following characters studied by Mendel in garden pea was found to be dominant?
  A)
  Green seed colour done clear
  B)
  Terminal flower position done clear
  C)
  Green pod colour done clear
  D)
  Wrinkled seed done clear
  View Solution play_arrow

• question_answer14)
  In a given plant red colour (R) of fruits is dominant over white fruit (r); tallness (T) is dominant over dwarfness (t). If a plant with genotype RRTt is crossed with a plant of genotype rrtt, what will be the percentage of tall plants with red fruits in the next generation?
  A)
  100% done clear
  B)
  25% done clear
  C)
  50% done clear
  D)
  75% done clear
  View Solution play_arrow

• question_answer15)
  If a dwarf pea plant was treated with gibberellic acid, it became a tall, as tall pea plants. If these pea plants are crossed with pure tall pea plants, what will be the phenotypic ratio in \[{{F}_{1}}\]generation?
  A)
  All dwarf plants done clear
  B)
  50% tall and 50% dwarf plants done clear
  C)
  75 % tall and 25 % dwarf plants done clear
  D)
  100% tall plants done clear
  View Solution play_arrow

• question_answer16)
  Red (dominant) flowered heterozygous crossed with white flower :
  A)
  \[350\text{ }-\text{ }red\text{ }:\text{ }350\text{ }\tilde{\ }\text{ }white\] done clear
  B)
  \[450\text{ }-\text{ }red\text{ }:\text{ }250\text{ }\tilde{\ }\text{ }white\] done clear
  C)
  \[380\text{ }-\text{ }red\text{ }:\text{ }250\text{ }\tilde{\ }\text{ }white\] done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer17)
  A tall plant was grown in nutrient deficient soil and remained dwarf. When it is crossed with dwarf plant then :
  A)
  All hybrid plants are dwarf done clear
  B)
  All hybrid plants are tall done clear
  C)
  50% tall and 50% of dwarf done clear
  D)
  75% tall and 25% dwarf done clear
  View Solution play_arrow

• question_answer18)
  A pure tall and a pure dwarf plant were crossed to produce offspring. Offsprings were self crossed, then find out the ratio between true breeding tall to true breeding dwarf?
  A)
  1 : 1 done clear
  B)
  3 : 1 done clear
  C)
  2 : 1 done clear
  D)
  1 : 2 : 1 done clear
  View Solution play_arrow

• question_answer19)
  Cross between unrelated group of organisms is called :
  A)
  Hybrid done clear
  B)
  Test cross done clear
  C)
  Back cross done clear
  D)
  Heterosis done clear
  View Solution play_arrow

• question_answer20)

  Cytoplasmic inheritance is due to :

  (1) Mitochondria and Chloroplast

  (2) Cilia and Flagella

  (3) Cytoplasmic particles

  (4) Cell wall and Cell coat

  A)
  1, 2 and 3 are correct done clear
  B)
  1 and 2 are correct done clear
  C)
  2 and 4 are correct done clear
  D)
  1 and 3 are correct done clear
  View Solution play_arrow

• question_answer21)
  Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called :
  A)
  Reciprocal cross done clear
  B)
  Test cross done clear
  C)
  Dihybrid cross done clear
  D)
  Back cross done clear
  View Solution play_arrow

• question_answer22)

  What is depicted in the following cross?

  A)
  Diagrammatic representation of test cross done clear
  B)
  Diagrammatic representation of out cross done clear
  C)
  Diagrammatic representation of reverse cross done clear
  D)
  Diagrammatic representation of dihybrid cross done clear
  View Solution play_arrow

• question_answer23)
  The phenotypic ratio in the \[{{F}_{2}}\] generation of a dihybrid cross is :
  A)
  9 : 3 : 3 : 1 done clear
  B)
  1 : 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1 done clear
  C)
  7 : 1 : 1 : 7 done clear
  D)
  1 : 2 : 3 : 4 done clear
  View Solution play_arrow

• question_answer24)
  A woman is married for the second time. Her first husband was ABO blood type A, and her child by that marriage was type O. Her new husband is type B and their child is type AB. What is the woman's ABO genotype and blood type?
  A)
  \[{{I}^{A}}{{I}^{O}}\]; Blood type A done clear
  B)
  \[{{I}^{A}}{{I}^{B}}\]; Blood type AB done clear
  C)
  \[{{I}^{B}}{{I}^{O}}\]; Blood type B done clear
  D)
  \[{{I}^{O}}{{I}^{O}}\]; Blood type O done clear
  View Solution play_arrow

• question_answer25)
  Codominance is depicted by
  A)
  B blood group done clear
  B)
  AB blood group done clear
  C)
  O blood group done clear
  D)
  A blood group done clear
  View Solution play_arrow

• question_answer26)

  The ABO blood grouping in human beings is an example for :

  (i) Dominance

  (ii) Incomplete dominance

  (iii) Co-dominance

  (iv) Multiple alleles

  A)
  (i) and (ii) only done clear
  B)
  (ii), (iii) and (iv) done clear
  C)
  (i) (ii) and (iv) done clear
  D)
  (iii) and (iv) only done clear
  View Solution play_arrow

• question_answer27)
  Which of the following genotypes does not produce an sugar polymer on the surface of the RBC ?
  A)
  \[{{I}^{A}}{{I}^{A}}\] done clear
  B)
  \[I{{i}^{B}}\] done clear
  C)
  \[{{I}^{A}}{{I}^{B}}\] done clear
  D)
  ii done clear
  View Solution play_arrow

• question_answer28)
  Inheritance of flower colour is an example of incomplete dominance which is seen in :
  A)
  Antirrhinum done clear
  B)
  Pisum done clear
  C)
  Solanum done clear
  D)
  Hibiscus done clear
  View Solution play_arrow

• question_answer29)
  Phenotypic ratio in plant Snapdragon in \[{{F}_{2}}\] is :
  A)
  1 : 1 done clear
  B)
  2 : 1 done clear
  C)
  3 : 1 done clear
  D)
  1 : 2 : 1 done clear
  View Solution play_arrow

• question_answer30)
  Test cross is used to :
  A)
  Check heterozygosity in \[{{F}_{1}}\] generation done clear
  B)
  Check heterozygosity in \[{{F}_{2}}\] generation done clear
  C)
  Check independent assortment in \[{{F}_{2}}\] generation done clear
  D)
  Check segregation in \[{{F}_{2}}\] generation done clear
  View Solution play_arrow

• question_answer31)
  The ultimate biological unit which controls heredity is called :
  A)
  Genome done clear
  B)
  Chromosome done clear
  C)
  Genotype done clear
  D)
  Gene done clear
  View Solution play_arrow

• question_answer32)
  For making important contributions in respect of the nature of genes, the Nobel prize was awarded :
  A)
  T.H. Morgan done clear
  B)
  de Vries done clear
  C)
  H.J. Muller done clear
  D)
  Darwin done clear
  View Solution play_arrow

• question_answer33)
  A pea plant parent having violet coloured flowers with unknown genotype was crossed with a plant having white coloured flowers, in the progeny 50% of the flowers were violet and 50% were white. The genotypic constitution of the parent having violet coloured flowers was:
  A)
  Homozygous done clear
  B)
  Merozygous done clear
  C)
  Heterozygous done clear
  D)
  Hemizygous done clear
  View Solution play_arrow

• question_answer34)

  Find out the correct option regarding the following cross?

  A)
  Monohybrid cross in pea plant done clear
  B)
  Trihybrid cross in pea plant done clear
  C)
  Out cross in pea plant done clear
  D)
  Dihybrid cross in pea plant done clear
  View Solution play_arrow

• question_answer35)
  ABO blood group is based on :
  A)
  Co-dominance done clear
  B)
  Incomplete dominance done clear
  C)
  Epistasis done clear
  D)
  Multiple allele done clear
  View Solution play_arrow

• question_answer36)
  Test cross of dihybrid ratio is 1 : 1 : 1 : 1. It proves that :
  A)
  \[{{F}_{1}}\] hybrid produces four different progenies done clear
  B)
  \[{{F}_{2}}\] hybrid is homozygous done clear
  C)
  Two different progenies are produced by \[{{P}_{1}}\] parents done clear
  D)
  \[{{F}_{2}}\] hybrid is heterozygous done clear
  View Solution play_arrow

• question_answer37)
  If \[{{F}_{1}}\] generation has all tall progenies and ratio of \[{{F}_{2}}\] generation is 3 : 1 (Tall : Dwarf), then it proves:
  A)
  Law of independent assortment done clear
  B)
  Law of segregation done clear
  C)
  Law of dominance done clear
  D)
  Incomplete dominance done clear
  View Solution play_arrow

• question_answer38)
  How many pairs of contrasting characters in pea pod were chosen by Mendel :
  A)
  3 done clear
  B)
  5 done clear
  C)
  7 done clear
  D)
  9 done clear
  View Solution play_arrow

• question_answer39)
  If a cross between two individual produce offsprings with 50% dominant character [A] and 50% recessive character [A] the genotype of parents are :
  A)
  Aa AA done clear
  B)
  Aa aa done clear
  C)
  AA aa done clear
  D)
  AA Aa done clear
  View Solution play_arrow

• question_answer40)
  When yellow round heterozygous pea plants are self-fertilized, the frequency of occurrence of RrYY genotype among the offsprings is
  A)
  9/16 done clear
  B)
  3/16 done clear
  C)
  2/16 done clear
  D)
  1/16 done clear
  View Solution play_arrow

• question_answer41)
  In an organism, tall phenotype is dominant over recessive dwarf phenotype, and the alleles are designate as T and t, respectively. Upon crossing two different individuals, total 250 offsprings were obtained. out of which 124 displayed tall phenotype and rest were dwarf. Thus, the genotype of the parents was
  A)
  \[TT\times TT\] done clear
  B)
  \[TT\times tt\] done clear
  C)
  \[Tt\times Tt\] done clear
  D)
  \[Tt\times tt\] done clear
  View Solution play_arrow

• question_answer42)
  In a monohybrid cross between two heterozygous individuals, the number of pure homozygous individual? obtained in \[{{F}_{1}}\] generation is
  A)
  2 done clear
  B)
  4 done clear
  C)
  6 done clear
  D)
  8 done clear
  View Solution play_arrow

• question_answer43)
  A woman with blood type 'O' has a child with blood type 'O'. If she claims a friend of hers with blood group 'A' as the father of the child, then the genotype of the father would be
  A)
  \[{{I}^{O}}{{I}^{O}}\] done clear
  B)
  \[{{I}^{A}}{{I}^{B}}\] done clear
  C)
  \[{{I}^{A}}{{I}^{O}}\] done clear
  D)
  \[{{I}^{A}}{{I}^{O}}\] done clear
  View Solution play_arrow

• question_answer44)
  A woman with straight hair mates with a man with curly hair who is known to be heterozygous for that trait. What is the chance that their first child will have curly hair?
  A)
  No chance done clear
  B)
  One in two done clear
  C)
  It is certain done clear
  D)
  One in four done clear
  View Solution play_arrow

• question_answer45)
  Which of the following crosses and resultant phenotype ratios are mismatched?
  A)
  \[Tt\times Tt-3\,:\,1\] done clear
  B)
  \[tt\times Tt-2\,;\,1\] done clear
  C)
  \[Tt\,\,Yy\,\,\times \,\,ttyy\,\,-\,\,1\,\,:\,\,1\,\,:\,\,1\,\,:\,\,1\] done clear
  D)
  \[Tt\,Yy\,\times \,\,TtYy\,\,\,-\,9\,\,:\,\,3\,\,:\,\,3\,\,:\,\,\,1\] done clear
  View Solution play_arrow

• question_answer46)
  A man having the genotype EEFfGgHH can produce P number of genetically different sperms, and a woman of genotype IuLLMmNn can generate Q number of genetically different eggs. Determine the values of P and Q
  A)
  P = 4, q = 4 done clear
  B)
  P = 4, q = 6 done clear
  C)
  P = 8, q = 4 done clear
  D)
  P = 8, q = 8 done clear
  View Solution play_arrow

• question_answer47)
  An organism, tall phenotype is dominant over recessive dwarf phenotype, and the alleles are designated as T and t, respectively. Upon crossing two different individuals, total 250 offsprings were obtained. out of which 124 displaced tall phenotype and rest were dwarf. Thus, the genotype of the parent; were
  A)
  \[TT\,\,\,\times \,\,\,TT\] done clear
  B)
  \[TT\,\,\,\times \,\,\,tt\] done clear
  C)
  \[Tt\,\,\,\times \,\,\,Tt\] done clear
  D)
  \[Tt\,\,\,\times \,\,\,tt\] done clear
  View Solution play_arrow

• question_answer48)
  When yellow round heterozygous pea plants are self-fertilized, the frequency of occurrence of RrYY genotype, among the offsprings is
  A)
  9/16 done clear
  B)
  3/16 done clear
  C)
  2/16 done clear
  D)
  1/16 done clear
  View Solution play_arrow

• question_answer49)
  ABO blood groups are determined by three different alleles. How many genotypes and phenotypes are possible?                                                                              
  A)

  Genotype	Phenotype
  3	1

  done clear
  B)

  Genotype	Phenotype
  6	4

  done clear
  C)

  Genotype	Phenotype
  4	6

  done clear
  D)

  Genotype	Phenotype
  9	7

  done clear
  View Solution play_arrow

• question_answer50)
  In a monohybrid cross between two heterozygous individuals, the number of pure homozygous individuals obtained in \[{{F}_{1}}\] generation is
  A)
  2 done clear
  B)
  4 done clear
  C)
  6 done clear
  D)
  8 done clear
  View Solution play_arrow

• question_answer51)
  In Mendel's seven contrasting traits of pea total number of colours tested by him was
  A)
  2 done clear
  B)
  3 done clear
  C)
  4 done clear
  D)
  5 done clear
  View Solution play_arrow

• question_answer52)
  Which of the following statements is correct?
  A)
  Each back cross is a test cross. done clear
  B)
  Each test cross is a back cross. done clear
  C)
  Crossing \[{{F}_{2}}\] with \[{{F}_{1}}\] is a test cross. done clear
  D)
  Crossing \[{{F}_{2}}\] with \[{{P}_{1}}\] is called a test cross. done clear
  View Solution play_arrow

• question_answer53)
  If a heterozygous tall plant is crossed with a homozygous dwarf plant, the proportion of dwarf progeny will be
  A)
  25% done clear
  B)
  50% done clear
  C)
  75% done clear
  D)
  100% done clear
  View Solution play_arrow

• question_answer54)
  An allele is
  A)
  Another word for gene done clear
  B)
  A homozygous genotype done clear
  C)
  A heterozygous genotype done clear
  D)
  One of the several possible forms of gene done clear
  View Solution play_arrow

• question_answer55)
  The graphical representation to calculate the probability of all possible genotypes of offsprings in a genetic cross was developed by
  A)
  Gregor Mendel done clear
  B)
  Kornberg done clear
  C)
  Har Gobind Khorana done clear
  D)
  Reginald C. Punnett done clear
  View Solution play_arrow

• question_answer56)
  Choose the wrong statement from the following.
  A)
  Failure of segregation of chromatids during cell division results in aneuploidy done clear
  B)
  Additional copy of 'X' chromosome in males results in Klinefelter's syndrome done clear
  C)
  Closely located genes in a chromosome always assort independently resulting in recombinants done clear
  D)
  According to Mendel, recessive character never blends in heterozygous condition done clear
  View Solution play_arrow

• question_answer57)
  In garden pea, round shape of seeds is dominant over wrinkled shape. A pea plant heterozygous for round shape of seed is selfed and 1600 seeds produced during the cross are subsequently germinated. How many seedings would have the parental phenotype?
  A)
  400 done clear
  B)
  1600 done clear
  C)
  1200 done clear
  D)
  800 done clear
  View Solution play_arrow

• question_answer58)
  In a plant species, flower colour yellow is dominant over white, and fruit shape round is dominant over elongated. Crossing was performed between two pure lines - one having yellow-flower and round fruit, and another with white-flower and elongated-fruit. About 20 plants survived in \[{{F}_{1}}\] progeny. Plants of \[{{F}_{1}}\] were allowed to self fertilize, and about 960 plants survived in \[{{F}_{2}}\]. If the traits follow Mendelian inheritance, the number of plants would have yellow flower and round fruit in \[{{F}_{1}}\] and \[{{F}_{2}}\] are respectively
  A)
  20, 960 done clear
  B)
  20, 540 done clear
  C)
  10, 180 done clear
  D)
  10, 60 done clear
  View Solution play_arrow

• question_answer59)
  Two plants one with black flower and other with white coloured flower were crossed in an experiment. In the next generation grey coloured flowers were obtained. The reason for the result is
  A)
  incomplete dominance done clear
  B)
  pseudodominance done clear
  C)
  codominance done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer60)
  Genes which code for a pair of contrasting characters are called
  A)
  factors done clear
  B)
  traits done clear
  C)
  alleles done clear
  D)
  gametes done clear
  View Solution play_arrow

• question_answer61)
  First husband of Asha had ABO blood type A and their child had type O. She remarried and her second husband had ABO blood type B and their child had type AB. What is the ABO genotype of Asha and also name her blood type?
  A)
  ii; Blood type O done clear
  B)
  \[{{I}^{B}}\,\,i\] ; Blood type B done clear
  C)
  \[{{I}^{A}}{{I}^{B}}\]; Blood type AB done clear
  D)
  \[{{I}^{A}}\,\,i\] ; Blood type A done clear
  View Solution play_arrow

• question_answer62)
  During incomplete dominance, \[{{F}_{2}}\] generation will have
  A)
  3 : 1 genotypic ratio done clear
  B)
  3 : 1 phenotypic ratio done clear
  C)
  1 : 2 : 1 genotypic ratio done clear
  D)
  2 : 2 : 1 phenotypic ratio done clear
  View Solution play_arrow

• question_answer63)
  Which of the following cross will give recessive progeny in \[{{F}_{1}}\] generation?
  A)
  \[TT\,\,\,\,\times \,\,\,\,\,tt\] done clear
  B)
  \[Tt\,\,\,\,\,\times \,\,\,\,TT\] done clear
  C)
  \[tt\,\,\,\,\,\times \,\,\,\,\,tt\] done clear
  D)
  \[TT\,\,\,\,\,\times \,\,\,\,\,\,TT\] done clear
  View Solution play_arrow

• question_answer64)
  In a dihybrid cross between two heterozygotes \[AaBb\,\,\times \,\,Aa\,\,Bb\], if we get 3 : 1 ratio among the offsprings, the reason for this may be
  A)
  polygenes done clear
  B)
  linked genes done clear
  C)
  pleiotropic genes done clear
  D)
  hypostatic genes done clear
  View Solution play_arrow

• question_answer65)
  What result Mendel would have got, had he self-pollinated a tall \[{{F}_{2}}\] plant?
  A)
  TT and Tt done clear
  B)
  All Tt done clear
  C)
  All TT done clear
  D)
  All tt done clear
  View Solution play_arrow

• question_answer66)
  Test cross is a cross between
  A)
  Hybrid \[\times \] dominant parent done clear
  B)
  Hybrid \[\times \] recessive parent done clear
  C)
  Hybrid \[\times \] hybrid parent done clear
  D)
  Two distantly related species done clear
  View Solution play_arrow

• question_answer67)
  Colchicine interferes with
  A)
  Chromosome replication done clear
  B)
  Organisation of spindle done clear
  C)
  Chromosome condensation done clear
  D)
  Incorporation of nitrogen base done clear
  View Solution play_arrow

• question_answer68)
  Webbed neck is a characteristic of
  A)
  XXY done clear
  B)
  XY done clear
  C)
  XXY done clear
  D)
  XO done clear
  View Solution play_arrow

• question_answer69)
  Daughter of a colour-blind father and normal mother marries a colour-blind person. Colour-blindness in the family shall be
  A)
  50% sons and 50% daughters done clear
  B)
  All sons and daughters done clear
  C)
  All daughters done clear
  D)
  All sons done clear
  View Solution play_arrow

• question_answer70)

  What are depicted in the following figure of chromosome?

  A)
  Dependent assortment of chromosomes done clear
  B)
  Independent assortment of Chromatin done clear
  C)
  Independent assortment of chromosomes done clear
  D)
  Dependent assortment of Chromatin done clear
  View Solution play_arrow

• question_answer71)
  Which one of the following statements is correct?
  A)
  Down's syndrome occurs mostly in the children of very young mothers done clear
  B)
  A person suffering from Down's syndrome has 47 chromosomes done clear
  C)
  Down's syndrome is very common and occurs once is every 50 births done clear
  D)
  Down's syndrome is caused when a sperm with an extra X chromosome fuses with a normal egg done clear
  View Solution play_arrow

• question_answer72)
  Recessive characters are expressed when present:
  A)
  Only when they are present on X chromosome of male done clear
  B)
  Only when they are present on X chromosomes of female done clear
  C)
  On any of autosome done clear
  D)
  On any one chromosome done clear
  View Solution play_arrow

• question_answer73)
  "Hypertrichosis" hairy ears are a sex-linked character associated with the
  A)
  X chromosome done clear
  B)
  XX chromosome done clear
  C)
  XY chromosome done clear
  D)
  Y chromosome done clear
  View Solution play_arrow

• question_answer74)
  If this type of chromosome combination is found in man, we call this the "Klinefelter's syndrome"
  A)
  One "X" chromosome and two "Y" chromosomes (XYY) done clear
  B)
  Three "X" chromosomes (XXX) done clear
  C)
  Three "Y" chromosomes (YYY) done clear
  D)
  Two "X" chromosomes and one "Y" chromosome (XXY) done clear
  View Solution play_arrow

• question_answer75)
  Mongoloid syndrome or Mongolian Idiocy is due to
  A)
  21 pairs normal, 22 and 23 extra chromosomes done clear
  B)
  22 pairs are normal, one chromosome has trisomy done clear
  C)
  24 pairs normal and one extra chromosome done clear
  D)
  22 pairs of normal chromosomes with one X chromosome done clear
  View Solution play_arrow

• question_answer76)
  The exchange of generic material between chromatids of paired homologous chromosomes during first meiotic division is called
  A)
  Transformation done clear
  B)
  Chiasmata done clear
  C)
  Crossing over done clear
  D)
  Synapsis done clear
  View Solution play_arrow

• question_answer77)
  Sex factor in bacteria
  A)
  Chromosomal replicon done clear
  B)
  F-Factor done clear
  C)
  RNA - Fimbrae done clear
  D)
  Sex-pilus done clear
  View Solution play_arrow

• question_answer78)
  A person with 47 chromosomes due to an additional Y chromosome suffers from a condition called
  A)
  Down's syndrome done clear
  B)
  Super male done clear
  C)
  Turner's syndrome done clear
  D)
  Klinefelter's syndrome done clear
  View Solution play_arrow

• question_answer79)
  For evolutionary success, a mutation must occur in
  A)
  Germplasm DNA done clear
  B)
  Somatic RNA done clear
  C)
  Germplasm RNA done clear
  D)
  Somatic DNA done clear
  View Solution play_arrow

• question_answer80)
  Sometimes chromosome number increase or decrease due to:
  A)
  Non-disjunction of chromosome done clear
  B)
  Genetic repetition done clear
  C)
  Mutation done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer81)

  The pedigree chart given below shows a particular trait which is absent in parents but present in the next generation irrespective of sexes. Draw your conclusion on the basis of the pedigree.

  A)
  Allosome linked and recessive in nature done clear
  B)
  Autosome linked and dominent in nature done clear
  C)
  Allosome linked and dominent in nature done clear
  D)
  Autosome linked and recessive in nature done clear
  View Solution play_arrow

• question_answer82)
  Mutations are mainly responsible for controlling :
  A)
  Increasing population rate done clear
  B)
  Maintaining genetic continuity done clear
  C)
  Variation in organisms done clear
  D)
  Extinction of organisms done clear
  View Solution play_arrow

• question_answer83)
  A woman with two genes, one for haemophilia and a gene for colour blindness on one of the 'X' chromosomes marries a normal man. Progeny will be : 
  A)
  All sons and daughters haemophilic and colour-blind done clear
  B)
  Haemophilic and colour-blind daughters done clear
  C)
  50% haemophilic colour-blind sons and 50% normal sons done clear
  D)
  50% haemophilic daughters and 50% colour-blind daughters done clear
  View Solution play_arrow

• question_answer84)
  In Down's syndrome, karyotyping has shown that the disorder is associated with trisomy of chromosome number 21 usually due to
  A)
  Addition of extra chromosome during mitosis of the zygote done clear
  B)
  Non-disjunction during egg-cell formation done clear
  C)
  Non-disjunction during sperm-cell formation done clear
  D)
  Non-disjunction during formation of egg cells and sperm-cells done clear
  View Solution play_arrow

• question_answer85)
  Mental retardation in man associated with sex chromosomal abnormality is usually due to :
  A)
  Reduction in X complement done clear
  B)
  Increase in X complement done clear
  C)
  Moderate increase in Y complement done clear
  D)
  Large increase in Y complement done clear
  View Solution play_arrow

• question_answer86)
  Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino?
  A)
  100% done clear
  B)
  25% done clear
  C)
  50% done clear
  D)
  75% done clear
  View Solution play_arrow

• question_answer87)
  One of the chief factors responsible for clotting of blood is present on :
  A)
  X Chromosome of male only done clear
  B)
  X Chromosome of female only done clear
  C)
  X Chromosome of both male and female done clear
  D)
  Autosomes only done clear
  View Solution play_arrow

• question_answer88)

  What is shown in the following figure of pedigrees?

  A)
  Autosomal recessive trait like myotonic dystrophy done clear
  B)
  Allosomal dominant trait like myotonic dystrophy done clear
  C)
  Autosomal dominant trait like myotonic dystrophy done clear
  D)
  Autosomal dominant trait like sickle - cell anaemia done clear
  View Solution play_arrow

• question_answer89)
  A colour-blind daughter is born when :
  A)
  Father is colour-blind, mother is normal done clear
  B)
  Mother is colour-blind, father is normal done clear
  C)
  Mother is carrier, father is normal done clear
  D)
  Mother is carrier, father is colour-blind done clear
  View Solution play_arrow

• question_answer90)
  In Down's syndrome (Mongolism) each cell has how many chromosomes:
  A)
  21st pair having one less done clear
  B)
  23rd pair with one less done clear
  C)
  45 chromosomes done clear
  D)
  47 chromosomes done clear
  View Solution play_arrow

• question_answer91)
  Where are Barr bodies found?
  A)
  Sperms of a man done clear
  B)
  Ova of a woman done clear
  C)
  Body cells (somatic) of man done clear
  D)
  Body cells (somatic) of woman done clear
  View Solution play_arrow

• question_answer92)
  The hereditary material present in the bacterium Escherichia coli is :
  A)
  Single stranded DNA       done clear
  B)
  Single stranded RNA done clear
  C)
  Double stranded DNA done clear
  D)
  Double stranded RNA done clear
  View Solution play_arrow

• question_answer93)
  Extranuclear genes occur in which of the following:
  A)
  Mitochondria and cytoplasm done clear
  B)
  Ribosomes and cytoplasm done clear
  C)
  ER and cytoplasm done clear
  D)
  Cytoplasm and Lysosomes done clear
  View Solution play_arrow

• question_answer94)
  Mutations generally occur in which of the following genes:
  A)
  Dominant genes done clear
  B)
  Recessive genes done clear
  C)
  Lethal genes done clear
  D)
  Mendel's genes done clear
  View Solution play_arrow

• question_answer95)
  Significance of the telomere is that it :
  A)
  Seals the chromosome done clear
  B)
  Stretches the spindle fibres done clear
  C)
  Synthesises proteins done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer96)
  Plasmids are useful in genetic engineering because they :
  A)
  Replicate independently done clear
  B)
  Carry useful genes done clear
  C)
  Are common in eukaryotes done clear
  D)
  Can be extracted from viruses done clear
  View Solution play_arrow

• question_answer97)
  Strength of linkage is inversely proportional to distance between the :
  A)
  Chromomeres done clear
  B)
  Genes done clear
  C)
  Telomeres done clear
  D)
  Chromatids done clear
  View Solution play_arrow

• question_answer98)
  If a group of genes are getting deleted and undergoing some change it is due to :
  A)
  Gene mutation done clear
  B)
  Aneuploidy done clear
  C)
  Chromosomal mutation done clear
  D)
  Gene modification done clear
  View Solution play_arrow

• question_answer99)
  XX male and XY female are very rare in humans. They are due to :
  A)
  Genes of Y-chromosome are on X chromosome done clear
  B)
  Crossing over between X and Y done clear
  C)
  Non-disjunction of chromosomes done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer100)
  Which of the following occurs more than one and less than five in chromosome?
  A)
  Chromomere done clear
  B)
  Chromatid done clear
  C)
  Centromere done clear
  D)
  Secondary constriction done clear
  View Solution play_arrow

• question_answer101)
  Change in sequence of nucleotide in DNA plant is:
  A)
  Mutation done clear
  B)
  Isolation done clear
  C)
  Polyploidy done clear
  D)
  Sexual reproduction done clear
  View Solution play_arrow

• question_answer102)
  The segment of DNA which participates in crossing over is known as :
  A)
  Muton done clear
  B)
  Cistron done clear
  C)
  Recon done clear
  D)
  Replicon done clear
  View Solution play_arrow

• question_answer103)
  Trisomy is :
  A)
  One chromosome less than 2n. done clear
  B)
  One chromosome more than 2n done clear
  C)
  A hybrid obtained by crossing diploid and tetraploid done clear
  D)
  Three chromosomes more than 2n done clear
  View Solution play_arrow

• question_answer104)
  Kappa particles in Paramecium are indicating:
  A)
  Nuclear inheritance done clear
  B)
  Cytoplasmic inheritance done clear
  C)
  Nucleo-cytoplasmic inheritance done clear
  D)
  Mutation done clear
  View Solution play_arrow

• question_answer105)
  Major role of colchicine in the eukaryotic cell is in :
  A)
  Reducing number of chiasmata done clear
  B)
  Causing endoduplication done clear
  C)
  Dividing the nucleus done clear
  D)
  Formation of polytene chromosome done clear
  View Solution play_arrow

• question_answer106)
  The genes present exclusively on the X-chromosome in humans is concerned with :
  A)
  Baldness and trichosis done clear
  B)
  Night-blindness done clear
  C)
  Facial hair and moustaches in males done clear
  D)
  Red-green colour blindness done clear
  View Solution play_arrow

• question_answer107)
  Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offsprings produced by an affected mother and normal father would be affected by this disorder?
  A)
  75% done clear
  B)
  50% done clear
  C)
  25% done clear
  D)
  100% done clear
  View Solution play_arrow

• question_answer108)
  Linkage map of X-chromosome of fruit fly has 66 units, with yellow body gene (y) at one end and bobbed hair [b] gene at the other end. The recombination frequency between these two genes (y and b) should be :
  A)
  > 75% done clear
  B)
  < 50% done clear
  C)
  100% done clear
  D)
  66% done clear
  View Solution play_arrow

• question_answer109)
  Genetic map of a eukaryotic cell is one that :
  A)
  Shows the stages during cell division done clear
  B)
  Establishes various stages in gene evolution done clear
  C)
  Establishes sites of genes on a chromosome done clear
  D)
  Shows the distribution of various species in a region done clear
  View Solution play_arrow

• question_answer110)
  Genes for cytoplasmic male sterility in plants are generally located in :
  A)
  Cytosol done clear
  B)
  Nuclear genome done clear
  C)
  Chloroplast genome done clear
  D)
  Mitochondrial genome done clear
  View Solution play_arrow

• question_answer111)
  When a diploid female plant (2n) is crossed with a tetraploid male plant (4n), then ploidy of endosperm cells in the resulting seed is :
  A)
  Triploidy done clear
  B)
  Diploidy done clear
  C)
  Pentaploidy done clear
  D)
  Tetraploidy done clear
  View Solution play_arrow

• question_answer112)
  After the mutation at a genetic locus, the character of an organism changes due to change in :
  A)
  DNA replication done clear
  B)
  Protein structure done clear
  C)
  RNA transcription pattern done clear
  D)
  Protein synthesis pattern done clear
  View Solution play_arrow

• question_answer113)
  One of the parents of a cross has a mutation in its mitochondria segregation of F2 progenies, mutaticz is found in :
  A)
  All the progenies done clear
  B)
  None of the progenies done clear
  C)
  One-third of the progenies done clear
  D)
  Fifty percent of progenies done clear
  View Solution play_arrow

• question_answer114)
  Lack of independent assortment of genes A and B in fruit fly Drosophila is due to :
  A)
  Repulsion done clear
  B)
  Linkage done clear
  C)
  Crossing over done clear
  D)
  Recombination done clear
  View Solution play_arrow

• question_answer115)

  Given below is the representation of a kind of chromosomal mutation. What is kind of mutation represented

  A)
  Deletion done clear
  B)
  Duplication done clear
  C)
  Inversion done clear
  D)
  Translocation done clear
  View Solution play_arrow

• question_answer116)
  Haemophilia is more commonly seen in human males than in human females because :
  A)
  A greater proportion of girls die in infancy done clear
  B)
  This disease is due to an Y linked recessive mutation done clear
  C)
  This disease is due to an X linked recessive mutant done clear
  D)
  This disease is due to an X linked dominant mutation done clear
  View Solution play_arrow

• question_answer117)
  In Drosophila, gene for white eye mutation is also responsible for depigmentation of body parts. Thus gene that controls several phenotypes is called :
  A)
  Oncogene done clear
  B)
  Epistatic gene done clear
  C)
  Hypostatic gene done clear
  D)
  Pleiotropic gene done clear
  View Solution play_arrow

• question_answer118)
  Phenylketonuria is the genetic disorder of :
  A)
  Trisomic condition done clear
  B)
  Monosomic condition done clear
  C)
  Autosomal dominant gene done clear
  D)
  Autosomal recessive gene done clear
  View Solution play_arrow

• question_answer119)
  Haemophilia is a condition, where there is :
  A)
  No production of haemoglobin in the blood done clear
  B)
  No production of melanin in the skin done clear
  C)
  A failure of clotting mechanism of blood done clear
  D)
  A delay in clotting of blood done clear
  View Solution play_arrow

• question_answer120)
  When the chromosome number of a given organism has one additional chromosome in one of the homologous pairs, the condition is known as
  A)
  Trisomy done clear
  B)
  Monosomy done clear
  C)
  Polyploidy done clear
  D)
  Nullisomy done clear
  View Solution play_arrow

• question_answer121)
  In a skip generation inheritance of colour-blindness trait from a colour-blind man is passed on to :
  A)
  Daughter done clear
  B)
  Son done clear
  C)
  Grand daughter done clear
  D)
  Grand son done clear
  View Solution play_arrow

• question_answer122)
  A medico-legal case of accidental interchange between two babies in a hospital, the baby of the blood group 'A' could not be rightly given to couple with :
  A)
  Husband of 'O' group and wife of 'AB' group done clear
  B)
  Husband of 'A' group and wife of 'B' group done clear
  C)
  Husband of 'B' group and wife of 'O' group done clear
  D)
  Husband of 'AB' group and wife of 'A' group done clear
  View Solution play_arrow

• question_answer123)
  Genes present is cytoplasm of eukaryotic cells are found in :
  A)
  Mitochondria and inherited via egg cytoplasm done clear
  B)
  Lysosomes and peroxisomes done clear
  C)
  Golgi bodies and smooth endoplasmic reticulum done clear
  D)
  Plastids and inherited via male gamete done clear
  View Solution play_arrow

• question_answer124)
  Action of ultraviolet rays on DNA is :
  A)
  Induction of thymidine done clear
  B)
  Deletion of base pair done clear
  C)
  Addition of base pair done clear
  D)
  Methylation of base pair done clear
  View Solution play_arrow

• question_answer125)
  In Klinefelter's syndrome, the sex chromosome complement is :
  A)
  22A + XXY done clear
  B)
  22 A + XO done clear
  C)
  22 A + XY done clear
  D)
  22 A + XX done clear
  View Solution play_arrow

• question_answer126)
  The recessive genes located on X-chromosome in humans are always :
  A)
  Lethal in male and female done clear
  B)
  Sub-lethal in male and female done clear
  C)
  Expressed in males done clear
  D)
  Expressed in females done clear
  View Solution play_arrow

• question_answer127)
  After a mutation at a genetic locus, the character of an organism changes due to the change in :
  A)
  Protein structure done clear
  B)
  DNA replication done clear
  C)
  Enzyme pattern done clear
  D)
  RNA transcription pattern done clear
  View Solution play_arrow

• question_answer128)
  A man and a woman, who do not show any apparent signs of certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance, do you suggest for the disease?
  A)
  Autosomal dominant done clear
  B)
  Sex-linked dominant done clear
  C)
  Sex-limited recessive done clear
  D)
  Sex-linked recessive done clear
  View Solution play_arrow

• question_answer129)
  A woman with normal vision, but whose father was colour-blind, marries a colour-blind man. Suppose that the fourth child of this couple was a boy. This boy :
  A)
  Must have normal colour vision done clear
  B)
  Will be partially colour-blind since he is heterozygous for the colour-blind mutant allele done clear
  C)
  Must be colour-blind done clear
  D)
  May be colour-blind or may be of normal vision done clear
  View Solution play_arrow

• question_answer130)
  Haemophilia is more commonly seen in human males than in human females because :
  A)
  This disease is due to an X-linked dominant mutation done clear
  B)
  A greater proportion of girls die in infancy done clear
  C)
  This disease is due to X-linked recessive mutation done clear
  D)
  This disease is due to Y-linked recessive mutation done clear
  View Solution play_arrow

• question_answer131)
  A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by:
  A)
  Down syndrome done clear
  B)
  Triploidy done clear
  C)
  Turner syndrome done clear
  D)
  Super femaleness done clear
  View Solution play_arrow

• question_answer132)
  Barr body of a mammal represents :
  A)
  All heterochromatin in female cells done clear
  B)
  All heterochromatin in male and female cells done clear
  C)
  The Y chromosome in the somatic cells of male done clear
  D)
  One of the two X-chromosomes in somatic cells of female done clear
  View Solution play_arrow

• question_answer133)
  Genetic counsellors can identify heterozygous individuals by :
  A)
  Height of an individuals done clear
  B)
  Colour of an individuals done clear
  C)
  Screening procedures done clear
  D)
  Weight of an individual done clear
  View Solution play_arrow

• question_answer134)
  A marriage between normal visioned man and colour-blind woman will produce, which of the following type of offspring?
  A)
  Normal sons and carrier daughters done clear
  B)
  Colour-blind sons and carrier daughters done clear
  C)
  Colour-blind sons and 50% carrier daughters done clear
  D)
  50% colour-blind sons and 50% carrier daughters done clear
  View Solution play_arrow

• question_answer135)
  Linkage group in Escherichia coli is/are :
  A)
  4 done clear
  B)
  2 done clear
  C)
  1 done clear
  D)
  5 done clear
  View Solution play_arrow

• question_answer136)
  Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?
  A)
  50% done clear
  B)
  25% done clear
  C)
  100% done clear
  D)
  75% done clear
  View Solution play_arrow

• question_answer137)
  Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) \[\times \] aabbcc (light colour), in \[{{F}_{2}}\] generation what proportion of the progeny is likely to resemble either parent?
  A)
  Half done clear
  B)
  Less than 5 percent done clear
  C)
  One third done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer138)
  Complete linkage is observed in :
  A)
  Male Drosophila sp. done clear
  B)
  Female Drosophila sp. done clear
  C)
  Female silkworm done clear
  D)
  Female rhesus monkey done clear
  View Solution play_arrow

• question_answer139)
  Mutations that arise suddenly in nature are called :
  A)
  Chromosomal mutations done clear
  B)
  Induced mutations done clear
  C)
  Gene mutations done clear
  D)
  Spontaneous mutations done clear
  View Solution play_arrow

• question_answer140)
  Occurrence of cell containing multiples of 2n genomes in diploid organisms is known as :
  A)
  Aneuploidy done clear
  B)
  Alloploidy done clear
  C)
  Amphiploidy done clear
  D)
  Endopolyploidy done clear
  View Solution play_arrow

• question_answer141)
  Skin colour in man is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) \[\times \] aabbcc (light colour), in \[{{F}_{2}}\] generation what proportion of the progeny is likely to resemble either parent?
  A)
  50% done clear
  B)
  3% done clear
  C)
  25% done clear
  D)
  75% done clear
  View Solution play_arrow

• question_answer142)
  Which of the following pair of features is a good example of polygenic inheritance?
  A)
  Human height and skin colour done clear
  B)
  ABO blood group in humans and flower colour of Mirabilis jalapa done clear
  C)
  Hair pigment of mouse and tongue rolling in humans done clear
  D)
  Human eye colour and sickle cell anaemia done clear
  View Solution play_arrow

• question_answer143)
  The gene which controls many characters is called :
  A)
  Codominant gene done clear
  B)
  Polygene done clear
  C)
  Pleiotropic gene done clear
  D)
  Multiple gene done clear
  View Solution play_arrow

• question_answer144)
  Sickle cell anaemia is :
  A)
  Autosomal dominant inheritance done clear
  B)
  X-linked recessive inheritance done clear
  C)
  Autosomal recessive inheritance done clear
  D)
  X-linked dominant inheritance done clear
  View Solution play_arrow

• question_answer145)
  Polyploidy can be produced artificially by :
  A)
  Colchicine done clear
  B)
  Inbreeding done clear
  C)
  Line breeding done clear
  D)
  Self-pollination done clear
  View Solution play_arrow

• question_answer146)
  Karyotype is :
  A)
  Chromosome complement which is specific for each species of living organism done clear
  B)
  All organisms possessing same type of chromosomes done clear
  C)
  Division of nucleus done clear
  D)
  One of the above done clear
  View Solution play_arrow

• question_answer147)
  Identify the wrong statements:
  A)
  In male grasshoppers 50 % of the sperms have no sex chromosome done clear
  B)
  Usually female birds produce two types of gametes based on sex chromosomes done clear
  C)
  The human males have one of their sex chromosomes much shorter than the other done clear
  D)
  In domesticated fowls the sex of the progeny depends on the type of sperm that fertilizes the egg done clear
  View Solution play_arrow

• question_answer148)
  Gynaecomastia is a common feature seen in:
  A)
  Down's syndrome done clear
  B)
  Turner's syndrome done clear
  C)
  PKU done clear
  D)
  Klinefelter's syndrome done clear
  View Solution play_arrow

• question_answer149)
  The graphical representation to calculate the probability of all possible genotypes of offspring in a genetic cross is called :
  A)
  Pedigree analysis done clear
  B)
  Karyotype done clear
  C)
  Punnett square done clear
  D)
  Chromosome map done clear
  View Solution play_arrow

• question_answer150)
  Chromosome is made up of :
  A)
  DNA + pectin done clear
  B)
  RNA + DNA done clear
  C)
  DNA + histone done clear
  D)
  Only histone done clear
  View Solution play_arrow

• question_answer151)

  What is shown in the following figure of human pedigrees?

  A)
  Autosomal dominant trait like Sickle - cell anaemia done clear
  B)
  Allosomal recessive trait like Sickle - cell anaemia done clear
  C)
  Autosomal recessive trait like colour blindness done clear
  D)
  Autosomal recessive trait like Sickle - cell anaemia done clear
  View Solution play_arrow

• question_answer152)
  In honeybee haploid stage develop into
  A)
  Male caste done clear
  B)
  Female caste done clear
  C)
  Neutral caste done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer153)
  The number of linkage group(s) present in man is :
  A)
  One done clear
  B)
  Two done clear
  C)
  Twenty-three done clear
  D)
  Seven done clear
  View Solution play_arrow

• question_answer154)
  The major cause of evolution of genes and protein is :
  A)
  Point mutation done clear
  B)
  Chromosomal aberration done clear
  C)
  Sexual reproduction done clear
  D)
  Gene duplication and divergence done clear
  View Solution play_arrow

• question_answer155)
  Due to nondisjunction of chromosomes during spermatogenesis, sperms carry both sex chromosomes (22A + XY) and some sperms do not carry any sex chromosome (22A + X). If these sperms fertilize normal eggs (22A + X), what types of genetic disorders appear among the offsprings?
  A)
  Turner's syndrome and Klinefelter's syndrome done clear
  B)
  Down's syndrome and Klinefelter's syndroos done clear
  C)
  Down's syndrome and Turner's syndrome done clear
  D)
  Down's syndrome and cri-du-chat syndrora done clear
  View Solution play_arrow

• question_answer156)
  Which genetic disorder is caused due to the presence of an additional copy of X-chromosome (A Karyotype of 44, XXY)?
  A)
  Klinefelter's syndrome done clear
  B)
  Down's syndrome done clear
  C)
  Turner syndrome done clear
  D)
  Edward's syndrome done clear
  View Solution play_arrow

• question_answer157)
  Multiple phenotype is seen in:
  A)
  dominance relationship done clear
  B)
  paniculate inheritance done clear
  C)
  monogenic inheritance done clear
  D)
  polygenic inheritance done clear
  View Solution play_arrow

• question_answer158)
  Cystic Fibrosis disease in human being is due to
  A)
  chromosome 5 done clear
  B)
  chromosome 6 done clear
  C)
  chromosome 7 done clear
  D)
  chromosome 8 done clear
  View Solution play_arrow

• question_answer159)
  In XO type of sex determination
  A)
  females produce two different types of gametes done clear
  B)
  males produce two different types of gametes done clear
  C)
  females produce gametes with Y chromosomes done clear
  D)
  males produce single type of gametes done clear
  View Solution play_arrow

• question_answer160)
  Who used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes and mapped their position on the chromosome?
  A)
  Gregor Mendel done clear
  B)
  Correns done clear
  C)
  Tschermark done clear
  D)
  Alfred Sturtevant done clear
  View Solution play_arrow

• question_answer161)
  Sickle cell anaemia is caused by the substitution of
  A)
  valine by glutamic acid at sixth position of alpha chain of haemoglobin. done clear
  B)
  valine by glutamic acid at sixth position of beta chain of haemoglobin. done clear
  C)
  glutamic acid by valine at sixth position of alpha chain of haemoglobin. done clear
  D)
  glutamic acid by valine at sixth position of beta chain of haemoglobin done clear
  View Solution play_arrow

• question_answer162)
  Which following pair of diseases is caused by two genes located on human X-Chromosome?
  A)
  Colour blindness and phenylketonuria. done clear
  B)
  Colour blindness and haemophilia. done clear
  C)
  Colour blindness and albinism. done clear
  D)
  Colour blindness and hypertrichosis. done clear
  View Solution play_arrow

• question_answer163)
  XX-XO type sex determination is recorded in
  A)
  Grasshopper done clear
  B)
  Drosophila done clear
  C)
  Frog done clear
  D)
  Earthworm done clear
  View Solution play_arrow

• question_answer164)
  In XO types of sex determination
  A)
  females produce two different types of gametes done clear
  B)
  Males produce two different types of gametes done clear
  C)
  females produce gametes with Y chromosomes done clear
  D)
  males produce single type of gametes done clear
  View Solution play_arrow

• question_answer165)
  The behaviour of the chromosomes was parallel to the behaviour of genes during meiosis was noted by
  A)
  Correns done clear
  B)
  Tschermark done clear
  C)
  Sutton and Boveri done clear
  D)
  de Vries done clear
  View Solution play_arrow

• question_answer166)
  Genes with multiple phenotypic effects are known as
  A)
  hypostatic genes done clear
  B)
  duplicate genes done clear
  C)
  pleiotropic genes done clear
  D)
  complementary genes done clear
  View Solution play_arrow

• question_answer167)
  In case of incomplete linkage, the parental combinations obtained in \[{{F}_{2}}\], generation are
  A)
  100% done clear
  B)
  more than 50% done clear
  C)
  25% done clear
  D)
  less than 50% done clear
  View Solution play_arrow

• question_answer168)
  Loss or gain of one more complete set of chromosomes along with the diploid complement is known as
  A)
  aneuploidy done clear
  B)
  euploidy done clear
  C)
  reverse tandem duplication done clear
  D)
  substitution done clear
  View Solution play_arrow

• question_answer169)
  The traits which are expressed in only a particular sex through their genes occurs in the opposite sex too are known as
  A)
  sex linked trait done clear
  B)
  sex influence trait done clear
  C)
  sex limited traits done clear
  D)
  sex affected traits done clear
  View Solution play_arrow

• question_answer170)
  Heterogamety is the term where an individual produces two types of gametes. The most appropriate answer is
  A)
  Male Drosophila fly done clear
  B)
  Female Drosophila fly done clear
  C)
  Female bird done clear
  D)
  Both [a] and [c] done clear
  View Solution play_arrow

• question_answer171)
  In our society women are blamed for producing female children. Choose the correct answer for the sex-determination in humans.
  A)
  Due to some defect like aspermia in man done clear
  B)
  Due to the genetic make up of the particular sperm which fertilizes the egg done clear
  C)
  Due to the genetic make up of the egg done clear
  D)
  Due to some defect in the women. done clear
  View Solution play_arrow

• question_answer172)
  Genetic variation in a population arises due to
  A)
  recombination only done clear
  B)
  mutation as well as recombination done clear
  C)
  reproductive isolation and selection done clear
  D)
  mutations only done clear
  View Solution play_arrow

• question_answer173)
  Which one is the incorrect statement with regard to the importance of pedigree analysis?
  A)
  It confirms that DNA is the carrier genetic information              done clear
  B)
  It helps to understand whether the trait in question is dominant or recessive. done clear
  C)
  It confirms that the trait is linked to one of the autosomes. done clear
  D)
  It helps to trace the inheritance of a specific trait. done clear
  View Solution play_arrow

• question_answer174)
  A colour-blind man marries the daughter of another colour-blind man whose wife has a normal genotype for colour vision. In their progeny
  A)
  all the children would be colour-blind done clear
  B)
  all their sons are colour-blind done clear
  C)
  none of the daughters would be colour-blind done clear
  D)
  half of their sons and half of their daughters would be colour-blind. done clear
  View Solution play_arrow

• question_answer175)
  Klinefelter's syndrome in human is an example of
  A)
  Auto polyploidy done clear
  B)
  Allopolyploidy done clear
  C)
  Diploidy done clear
  D)
  Aneuploidy done clear
  View Solution play_arrow

• question_answer176)
  A person affected with phenylketonuria, lacks an enzyme that converts the amino acid phenylalanininto
  A)
  valine done clear
  B)
  proline done clear
  C)
  histidine done clear
  D)
  tyrosine done clear
  View Solution play_arrow

• question_answer177)
  In sickle cell anemia, the sequence of amino acids from the first to the seventh position of the p-chain of haemoglobin S(HbS) is
  A)
  His, Leu, Thr, Pro, Glu, Val, Val done clear
  B)
  Val, His, Leu, Thr, Pro, Glu, Glu done clear
  C)
  Thr, His, Pro, Val, Pro, Val, Glu done clear
  D)
  Val, His, Leu, Thr, Pro, Val, Glu done clear
  View Solution play_arrow

• question_answer178)

  Statement-A: For a particular character in an individual, each gamete gets only one allele.

  Statement-B: Chromatids of a chromosome split (separate) and move towards opposite poles during anaphase of mitosis.

  A)
  Statement A is correct and statement B is wrong. done clear
  B)
  Both the statements are correct and B is the reason for A. done clear
  C)
  Statement B is correct and statement A is wrong. done clear
  D)
  Both the statements are correct and B is not the reason for A. done clear
  View Solution play_arrow

• question_answer179)
  Sickle cell anaemia is caused due to the substitution of
  A)
  valine at the 6th position of beta globin chain by glutamine done clear
  B)
  valine at the 6th position of alpha globin chain by glutamic acid done clear
  C)
  glycine at the 6th position of alpha globin chain by glutamic acid done clear
  D)
  glutamic acid at the 6th position of beta globin chain by valine done clear
  View Solution play_arrow

• question_answer180)
  Anish is having colour blindness and married to Sheela, who is not colour-blind. What is the chance that their son will have the disease?
  A)
  100% done clear
  B)
  50% done clear
  C)
  25% done clear
  D)
  0% done clear
  View Solution play_arrow

• question_answer181)
  The frequency of crossing over occurring between two genes located on the same chromosome depends on
  A)
  length of the chromosome done clear
  B)
  position of the centromere done clear
  C)
  activities of two genes done clear
  D)
  distance between two genes done clear
  View Solution play_arrow

• question_answer182)
  The enzyme involved in the crossing over between two homologous chromosomes is
  A)
  nuclease done clear
  B)
  RNA polymerase done clear
  C)
  recombinase done clear
  D)
  DNA polymerase done clear
  View Solution play_arrow

• question_answer183)
  A couple, both carriers for the gene sickle cell anaemia planning to get married, wants to know the chances of having anaemic progeny?
  A)
  100% done clear
  B)
  75% done clear
  C)
  50% done clear
  D)
  25% done clear
  View Solution play_arrow

• question_answer184)
  The total number of types of gametes produced in across between a negro and albino parent is
  A)
  64 done clear
  B)
  16 done clear
  C)
  08 done clear
  D)
  04 done clear
  View Solution play_arrow

• question_answer185)
  Which of the following is correct match?
  A)

  I		II		III
  Thalassemia	[A]	XO	(i)	Flat nose, simian crease

  done clear
  B)

  I		II		III
  Down's syndrome	[B]	42 AA + XY	(ii)	Webbing of neck

  done clear
  C)

  I		II		III	I
  	Turner's syndrome	[C]	44 AA + XXX	(iii)	Anaemia, jaundice

  done clear
  D)

  I		II		III
  Klinefelter's syndrome	[D]	44 AA + XXY	(iv)	Tall, thin, eunuchoid

  done clear
  View Solution play_arrow

• question_answer186)
  Sex determination by chromosomal difference in man and Drosophila is by mechanism called
  A)
  XX-XY                    done clear
  B)
  XX-XO done clear
  C)
  ZZ-ZW done clear
  D)
  Both [a] and [b] done clear
  View Solution play_arrow

• question_answer187)
  Which of the following set of syndromes show 47 chromosomes in their genetic make up?
  A)
  Down's syndrome, Patau's syndrome, Edward's syndrome done clear
  B)
  Turner's syndrome, Edward's syndrome, Klinefelter's syndrome done clear
  C)
  Klinefelter's syndrome. Turner's syndrome, Edward's syndrome done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer188)
  In order to lessen the suffering of phenylketonurics their diet should have
  A)
  no phenylalanine and no tyrosine done clear
  B)
  low phenylalanine and normal requirement of tyrosine done clear
  C)
  normal recommended amount of phenylalanine done clear
  D)
  normal recommended amount of both phenylalanine and tyrosine done clear
  View Solution play_arrow

• question_answer189)
  Drosophila flies with XXY genotype are females, but human beings with such genotype are abnormal males. It shows that :
  A)
  Y-chromosome is essential for sex determination in Drosophila done clear
  B)
  Y-chromosome in female determining in Drosophila done clear
  C)
  Y-chromosome is male determining in human beings done clear
  D)
  Y-chromosome has no role in sex determination either in Drosophila or in human beings done clear
  View Solution play_arrow

• question_answer190)

  Linkage groups :

  1. Have genes, which were linked together in a single chromosome

  2. Show independent assortment

  3. Do not show independent assortment

  4. In prokaryotes are more than one

  A)
  1, 2 and 3 are correct done clear
  B)
  1 and 2 are correct done clear
  C)
  2 and 4 are correct done clear
  D)
  1 and 3 are correct done clear
  View Solution play_arrow

• question_answer191)
  Which of the following statements about colour blindness is correct?
  A)
  2% men are red colour blind, 6% are green colour blind done clear
  B)
  6% men are red colour blind, 2% are green colour blind done clear
  C)
  10% men are red colour blind, 5% are green colour blind done clear
  D)
  5% men are red colour blind, 10% are green colour blind done clear
  View Solution play_arrow

• question_answer192)
  Choose the wrong statement.
  A)
  In grasshoppers, besides autosomes males have only one X-chromosome, whereas females have a pair of X-chromosomes. done clear
  B)
  In XY type of sex determination, both males and females have same number of chromosomes. done clear
  C)
  In Drosophila, males have one X and one Y chromosome, whereas females have a pair of X- chromosomes besides autosomes done clear
  D)
  In insects with XO type of sex determination, all sperms bear X-chromosome besides autosomes done clear
  View Solution play_arrow

• question_answer193)
  Which one of the following is an example of poly genie inheritance?
  A)
  Flower colour in Mirabilis jalapa done clear
  B)
  Production of male honey bee done clear
  C)
  Pod shape in garden pea done clear
  D)
  Skin colour in humans done clear
  View Solution play_arrow

• question_answer194)
  Identify a Mendelian disorder from the following :
  A)
  Down's syndrome done clear
  B)
  Turner's syndrome done clear
  C)
  Phenylketonuria done clear
  D)
  Kline feller's syndrome done clear
  View Solution play_arrow

• question_answer195)
  A man, whose father is colour blind, marries a lady who is daughter of a colour-blind man. Their off springs will be
  A)
  all normal done clear
  B)
  all colour blinds done clear
  C)
  all sons colour blind done clear
  D)
  some sons colour blind and some normal done clear
  View Solution play_arrow