NEET Biology Principle Of Inheritance And Variation Question Bank

done Self Evaluation Test - Principles of Inheritance and Variation Total Questions - 89

• question_answer1)
  Which one of the following traits of garden pea studied by Mendel, was a recessive feature?
  A)
  Round seed shape                       done clear
  B)
  Axial flower position done clear
  C)
  Green seed colour                       done clear
  D)
  Green pod colour done clear
  View Solution play_arrow

• question_answer2)
  In a certain plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant rrtt genotype, what will be the percentage of tall plants with red fruits in the progeny?
  A)
  50% done clear
  B)
  100% done clear
  C)
  75%                                          done clear
  D)
  25% done clear
  View Solution play_arrow

• question_answer3)
  Suppose that in sheep, a dominant allele [B] produces black hair and a recessive allele [b] produces white hair. If you  saw a black sheep, you would be able to identify:
  A)
  Its phenotype for hair colour. done clear
  B)
  Its genotype for hair colour. done clear
  C)
  The genotypes for only one of its parents. done clear
  D)
  The genotypes for both of its parents. done clear
  View Solution play_arrow

• question_answer4)
  Mendel's rules do not correctly predict patterns of inheritance for tightly linked genes or the inheritance of alleles that show incomplete dominance or epistasis. Does this mean that his hypothesis are incorrect?
  A)
  Yes, because they are relevant to only a small number of organisms and traits. done clear
  B)
  Yes, because not all data support his hypothesis. done clear
  C)
  No, because he was not aware of meiosis or the chromosome theory of inheritance. done clear
  D)
  No, it just means that his hypothesis are limited to certain conditions. done clear
  View Solution play_arrow

• question_answer5)
  In the \[{{F}_{2}}\]generation of a dihybrid cross between yellow, round seeded and green, wrinkled seeded pea plants, 17 out of 254 pea seeds were green and wrinkled. Other seeds were: Yellow and round; green and round; yellow and wrinkled. These results indicate which of the following statement?
  A)
  Crossing over has occurred. done clear
  B)
  Green and wrinkled are both recessive characters. done clear
  C)
  The alleles for green and wrinkled are linked. done clear
  D)
  The allele for green is recessive but not the allele for wrinkled. done clear
  View Solution play_arrow

• question_answer6)
  The \[{{F}_{2}}\] generation of a cross produced identical phenotypic and genotypic ratio. It is not an expected Mendelian result, and can be attributed to:
  A)
  Independent assortment done clear
  B)
  Linkage done clear
  C)
  Incomplete dominance done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer7)
  The total number of progeny obtained through dihybrid cross of Mendel is 1280 in \[{{F}_{2}}\] generation. How many of them are recombinants?
  A)
  240                                           done clear
  B)
  360 done clear
  C)
  480             done clear
  D)
  720 done clear
  View Solution play_arrow

• question_answer8)
  Which of the following is not a hereditary disease?
  A)
  Cystic fibrosis    done clear
  B)
                     Thalassemia done clear
  C)
  Haemophilia     done clear
  D)
                     Cretinism done clear
  View Solution play_arrow

• question_answer9)
  A women with 47 chromosomes due to three copies of chromosome 21 is characterised by:
  A)
  Superfemaleness done clear
  B)
                     Triploidy done clear
  C)
  Turner's syndrome                       done clear
  D)
  Down's syndrome done clear
  View Solution play_arrow

• question_answer10)
  A modified dihybrid mendelian ratio of 9 : 3 : 4 indicates:
  A)
  Supplementary genes done clear
  B)
  Complementary genes done clear
  C)
  Lethal genes done clear
  D)
  Epistatic genes done clear
  View Solution play_arrow

• question_answer11)
  In multiple allele system, a gamete possesses:
  A)
  Two alleles       done clear
  B)
                     Three alleles done clear
  C)
  One allele    done clear
  D)
                     Several alleles done clear
  View Solution play_arrow

• question_answer12)
  Which of the following parental phenotypes would produce offspring with blood group phenotypes in the expected ratio of 1 type A: 1 type B?
  A)

  Blood group of mother	Blood group of father
  A	B

    done clear
  B)

  AB

  AB

    done clear
  C)

  AB

  B

    done clear
  D)

  AB

  O

    done clear
  View Solution play_arrow

• question_answer13)
  Which mendelian principle will not operate if two genes under study are close together?
  A)
  Paired unit factors     done clear
  B)
  Dominace             done clear
  C)
  Segregation done clear
  D)
  Independent assortment done clear
  View Solution play_arrow

• question_answer14)
  The person with Turner's syndrome has:
  A)
  45 autosomes and X sex chromosome done clear
  B)
               44 autosomes and XYY sex chromosomes done clear
  C)
  45 autosomes and XYY sex chromosomes done clear
  D)
  44 autosomes and X sex chromosome done clear
  View Solution play_arrow

• question_answer15)
  Mongolism, Edward's syndrome and Patau's syndrome are due to:
  A)
  Autosomal abnormalities done clear
  B)
  Allosomal abnormalities done clear
  C)
                                                  Both [a] and [b] done clear
  D)
                                                  None of the above done clear
  View Solution play_arrow

• question_answer16)
  Albinism and phenylketonuria are disorders due to:
  A)
  Recessive autosomal genes done clear
  B)
  Dominant autosomal genes done clear
  C)
  Recessive sex genes done clear
  D)
  Dominant sex genes done clear
  View Solution play_arrow

• question_answer17)
  In Klinefelter's syndrome, the sex chromosome compliment is:
  A)
  22AA+XXY done clear
  B)
                     22AA+XO done clear
  C)
  22AA+XY     done clear
  D)
                     22AA+XX done clear
  View Solution play_arrow

• question_answer18)
  Which of the following is related to heart diseases?
  A)
  Turner's syndrome                       done clear
  B)
  Edward's syndrome done clear
  C)
  Cushing's syndrome                     done clear
  D)
  Patau's syndrome done clear
  View Solution play_arrow

• question_answer19)
  In Drosophila XXY represents a female but in human it is an abnormal male. It shows that:
  A)
  Y-chromosome is essential for male sex in human. done clear
  B)
  Y-chromosome is essential for female sex determination in Drosophila. done clear
  C)
  Y-chromosome is not essential for male sex determination in human. done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer20)
  Identify the type of inheritance shown in the given figure.                         
  A)
  Dominant X-linked                      done clear
  B)
  Recessive X-linked done clear
  C)
  Dominant Y-linked                      done clear
  D)
  Recessive Y-linked done clear
  View Solution play_arrow

• question_answer21)
  Given below is a highly simplified representation of the human sex chromosomes from a karyotype. The gene a and b could be of:                                                
  A)
  colour blindness and body height. done clear
  B)
  attached ear lobe and Rhesus blood group. done clear
  C)
  haemophilia and red-green colour blindness. done clear
  D)
  phenylketonuria and haemophilia. done clear
  View Solution play_arrow

• question_answer22)
  Mary's father has haemophilia but her husband is also haemophilic. What would be the chance other daughter having this disease?
  A)
  0%                                            done clear
  B)
  50% done clear
  C)
  100%                                        done clear
  D)
  25% done clear
  View Solution play_arrow

• question_answer23)
  Match the terms given in column-I with their description given in column-II and choose the correct option.

  	Column-I		Column-II
  A.	ABO blood groups	I.	Dihybrid cross
  B.	Low of segregation	II.	Monohybrid cross
  C.	Low of Independent assortment	III.	Base pairs substitution
  D.	Gene mutation	IV.	Multiple allelism

  A)
  A-II;    B-I;    C-IV;   D-III done clear
  B)
  A-IV;   B-I;    C-II;    D-III done clear
  C)
  A-IV;    B-II;   C-I;     D-III done clear
  D)
  A-II;     B-III;  C-IV;   D-I done clear
  View Solution play_arrow

• question_answer24)
  Which of the following statements regarding: crossing-over is incorrect?
  A)
  Crossing-over disrupts the linkage between genes on the same chromosome. done clear
  B)
  Crossing-over disrupts the linkage between genes on different chromosomes. done clear
  C)
  Crossing-over produces new genetic combinations. done clear
  D)
  Crossing-over produces   non-parental chromosomes. done clear
  View Solution play_arrow

• question_answer25)
  Drosophila flies with XXY genotype are females but in case of humans, such individuals are abnormal males (Klinefelter's syndrome). This indicates that:
  A)
  The Y chromosome has no role in sex determination. done clear
  B)
  In Drosophila, the Y chromosome is essential for sex determination. done clear
  C)
  The Y chromosome is male determining in humans. done clear
  D)
  The Y chromosome is female determining in Drosophila. done clear
  View Solution play_arrow

• question_answer26)
  Christmas disease is another name of:
  A)
  Sleeping sickness done clear
  B)
                     Haemophilia done clear
  C)
  Hepatitis B      done clear
  D)
                     Down's syndrome done clear
  View Solution play_arrow

• question_answer27)
  Barr-body (seen in saliva test in Olympic games) is associated with:
  A)
  Y-chromosome   done clear
  B)
                     X-chromosome done clear
  C)
  Autosome       done clear
  D)
                     Male sex only done clear
  View Solution play_arrow

• question_answer28)
  The males of grasshoppers and bugs possess two sets of autosomes and:
  A)
  Only Y-chromosome done clear
  B)
  Only X-chromosome done clear
  C)
  X and Y-chromosome done clear
  D)
  Neither X nor Y-chromosome done clear
  View Solution play_arrow

• question_answer29)
  Which of the following match is correct?
  A)
  Sickel cell anaemia - X-chromosome done clear
  B)
  Down Syndrome - 21 chromosome done clear
  C)
  Parkinsonism - XY chromosome done clear
  D)
  Haemophilia - Y chromosome done clear
  View Solution play_arrow

• question_answer30)
  There are three genes a, b, c. Percentage of crossing over between a and b is 20%, b and c is 28% an a and c is 8%. What is the sequence of genes on chromosome?   
  A)
  b, a, c         done clear
  B)
  a, b, c done clear
  C)
  a, c, b                                       done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer31)
  Human skin colour is controlled by several gene pairs. Let us assume here that there are just three gene pairs on different chromosomes and that for each pair there are two alleles, an incompletely dominant one that codes for melanin deposition and an incompletely recessive one that codes for no melanin deposition. If a very dark skinned person marries a very light skinned woman, what will be the chance that their offspring will have very dark skin?   
  A)
  1/64  done clear
  B)
  1/4    done clear
  C)
  5/8                                            done clear
  D)
  9/64 done clear
  View Solution play_arrow

• question_answer32)
  Rh factor is responsible for which of the following disease?
  A)
  AIDS done clear
  B)
  Turner's syndrome done clear
  C)
  Erythroblastosis foetalis done clear
  D)
  Sickle -cell anaemia done clear
  View Solution play_arrow

• question_answer33)
  Repeated selfing produces:
  A)
  Heterozygosity done clear
  B)
  Homozygosity done clear
  C)
  Homozygosity in some and heterozygosity in other traits done clear
  D)
  Pure hybrids done clear
  View Solution play_arrow

• question_answer34)
  In genetics, the term test cross means:
  A)
  The crossing of \[{{F}_{1}}\] individual with homozygous recessive. done clear
  B)
  Crossing an \[{{F}_{1}}\] individual with either of the two parents. done clear
  C)
  Crossing \[{{F}_{1}}\] individual with another \[{{F}_{1}}\] individual. done clear
  D)
  Crossing \[{{F}_{1}}\] individual with that of \[{{F}_{2}}\]. done clear
  View Solution play_arrow

• question_answer35)
  In Mendelian dihybrid cross, when heterozygous round yellow are self crossed, round green offsprings are produced which are represented by genotype?
  A)
  RrYy, RrYY, RRYy                      done clear
  B)
  RrYY, RRyy, rryy done clear
  C)
  rrYy, rrYY                                  done clear
  D)
  RRyy, Rryy done clear
  View Solution play_arrow

• question_answer36)
  Which of the following illustrates pleiotropy?
  A)
  In fruit flies, the genes for scarlet eyes and hairy body are located on the same chromosome. done clear
  B)
  Matings between earless sheep and long eared sheep always result in short-eared offspring. done clear
  C)
  Wheat kernels can range from white to red in color, a trait controlled by several genes. done clear
  D)
  The human cystic fibrosis gene causes many symptoms, from respiratory distress to digestive problems. done clear
  View Solution play_arrow

• question_answer37)
  A pea plant with purple flowers is heterozygous for flower colour. Its genotype is Pp. The P and p alleles in the pea plant's cells are located:
  A)
  next to each other on the same chromosome. done clear
  B)
  at the same location on homologous chromosomes. done clear
  C)
  on the X and Y chromosomes. done clear
  D)
  some distance apart on the same chromosome. done clear
  View Solution play_arrow

• question_answer38)
  Consider a gene that has two alleles and shows complete dominance. When two heterozygotes for this gene breed, they have a 25% chance of producing a homozygous recessive offspring. The next time they breed, what are the chances that they will once again have a homozygous recessive progeny?     
  A)
  0%                                            done clear
  B)
  25% done clear
  C)
  75%                                          done clear
  D)
  100% done clear
  View Solution play_arrow

• question_answer39)
  When dominant and recessive alleles express itself together it is called _______.
  A)
  codominance    done clear
  B)
                     dominance done clear
  C)
  amphidominace  done clear
  D)
                     pseudodominance done clear
  View Solution play_arrow

• question_answer40)
  The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes?
  A)
  Four            done clear
  B)
  Seven done clear
  C)
  Six                                            done clear
  D)
  Five done clear
  View Solution play_arrow

• question_answer41)
  Ban- body is found in:
  A)
  Male somatic cells done clear
  B)
  Male germinal cells done clear
  C)
  Female somatic cells done clear
  D)
  Female germinal cells done clear
  View Solution play_arrow

• question_answer42)
  Which of the following chromosome arrangement is symbolised by 2n + 2?
  A)
  Tetraploid       done clear
  B)
                     Nullisomic done clear
  C)
  Trisomic        done clear
  D)
                     Tetrasomic done clear
  View Solution play_arrow

• question_answer43)
  Match the column-I with column-II and choose the correct option.

  	Column-I		Columan-II
  A.	Non-parental gene exchange	I.	Crossing over
  B.	Non-sister chromatids	II.	X and Y
  C.	Sex chromosome	III.	Autosome- linked disease
  D.	Thalassaemia	IV.	Recombination

  A)
  A-IV;     B-I;     C-II;     D-III done clear
  B)
  A-II;       B-I;     C-IV;   D-III done clear
  C)
  A-II;       B-IV;   C-III;   D-I done clear
  D)
  A-II;       B-IV;   C-I;     D-III done clear
  View Solution play_arrow

• question_answer44)
  Human skin colour is the example of:   

  (i) Multiple gene inheritance.

  (ii) Three separate genes control this trait. 3

  (iii) Single gene controls this trait.

  (iv) Two genes control this trait.

  (v) A significant role played by environment

  Which of the following statements are correct

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

• question_answer45)
  The experiment shown in the figure has been carried out by Morgan to show the phenomenon of linkage and recombination. If in Cross I, genes are tightly linked and in Cross D, genes are loosely linked then what will be the percentage of recombinants produced in Cross I and Cross II respectively?
  A)
  98.7% and 62.8%                       done clear
  B)
  1.3% and 37.2% done clear
  C)
  37.2% and 1.3% done clear
  D)
                     62.8% and 98.7% done clear
  View Solution play_arrow

• question_answer46)
  Match the symbols used in human pedigree analysis given in column-I with their name given in column-II and choose the correct option.

  	Column-I		Column-II
  A.		I.	Consanguineous mating
  B.		II.	Normal female
  C.		III.	Mating
  D.		IV.	Affected female
  E.		V.	Parents with male child affected with disease
  		VI.	Sex unspecified

  A)
  A-III;    B-I;     C-II;    D-V;   E-IV done clear
  B)
               A-II;     B-I;     C-VI;   D-III;   E-IV done clear
  C)
  A-III;    B-IV;   C-I;     D-V;    E-II done clear
  D)
  A-III;    B-I;     C-VI;   D-V;    E-IV done clear
  View Solution play_arrow

• question_answer47)
  Sickle cell anaemia is:
  A)
  caused by substitution of valine by glutamic acid in the beta globin chain of haemoglobin. done clear
  B)
  caused by a change in a single base pair of DNA. done clear
  C)
  characterised by elongated sickle like RBCs with a nucleus. done clear
  D)
  an autosomal linked dominant trait. done clear
  View Solution play_arrow

• question_answer48)
  The person affected by Turner's syndrome has:
  A)
  45 autosomes and X sex chromosome done clear
  B)
  44 autosomes and XYY sex chromosomes done clear
  C)
  45 autosomes and XYY sex chromosomes done clear
  D)
  44 autosomes and X sex chromosome done clear
  View Solution play_arrow

• question_answer49)
  In Drosophila, the sex is determined by:
  A)
  whether the egg is fertilised or develops parthenogenetically. done clear
  B)
  the ratio of number of X-chromosomes to the sets of autosomes. done clear
  C)
  X and Y chromosomes. done clear
  D)
  the ratio of pairs of X-chromosomes to the pairs of autosomes. done clear
  View Solution play_arrow

• question_answer50)
  Alkaptonuria is:
  A)
  Sex linked dominant disorder done clear
  B)
  Sex linked recessive disorder done clear
  C)
  Autosomal recessive disorder done clear
  D)
  Autosomal dominant disorder done clear
  View Solution play_arrow

• question_answer51)
  A normal woman is married to a man having hypertrichosis. They got one daughter and one son. What would be the possibility of their daughter to show hypertrichosis condition?
  A)
  0%  done clear
  B)
  25% done clear
  C)
  50%                                          done clear
  D)
  75% done clear
  View Solution play_arrow

• question_answer52)
  A pregnant woman who has done amniocentesis test finds an extra Ban- body in her embryo. The syndrome which is likely to be associated with the embryo is:            
  A)
  Edward's syndrome    done clear
  B)
  Down's syndrome done clear
  C)
  Klinefelter's syndrome                  done clear
  D)
  Patau's syndrome done clear
  View Solution play_arrow

• question_answer53)
  The 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)
  100%                                        done clear
  B)
  66% done clear
  C)
  >50%                                       done clear
  D)
  \[\le 50%\] done clear
  View Solution play_arrow

• question_answer54)
  In Shepherd's Purse, the fruit shape is controlled by:
  A)
  Supplementary genes done clear
  B)
  Complementary genes done clear
  C)
  Duplicate genes done clear
  D)
  Polymeric genes done clear
  View Solution play_arrow

• question_answer55)
  A diseased man marries a normal woman. They have three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is:   
  A)
  Sex-linked dominant   done clear
  B)
  Sex-linked recessive done clear
  C)
  Sex-linked character done clear
  D)
  Autosomal dominant done clear
  View Solution play_arrow

• question_answer56)
  One chromosome of a homologous pair carries the genes J and K. The other chromosome of the pair carries the genes j and k at corresponding loci. Crossing over results in exchange of chromosome segments and production of gametes with new combinations of genes. A recombinant type gamete resulting from this crossover might contain:  
  A)
  Genes J and K   done clear
  B)
                     Genes j and K done clear
  C)
  Genes J and j    done clear
  D)
                     Genes j and k done clear
  View Solution play_arrow

• question_answer57)
  Appearance of hidden character in some progeny of \[{{F}_{2}}\] population indicates:
  A)
  Law of purity of gametes done clear
  B)
  Law of independent assortment done clear
  C)
  Law of dominance done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer58)
  Punnett square is used to know:
  A)
  outcome of a cross done clear
  B)
  probable result of a cross done clear
  C)
  types of gametes done clear
  D)
  result of meiosis done clear
  View Solution play_arrow

• question_answer59)
  In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype:       
  A)
  AABB                                       done clear
  B)
  AaBb done clear
  C)
  aabb           done clear
  D)
  aaBB done clear
  View Solution play_arrow

• question_answer60)
  Universal donor blood group is:
  A)
  AB   done clear
  B)
                     0    done clear
  C)
  A                                              done clear
  D)
  B done clear
  View Solution play_arrow

• question_answer61)
  Given pedigree shows that the trait is inherited as autosomal dominant. Trace the genotype of Mother and Father.     
  A)
  Father AA, Mother aa done clear
  B)
  Father AA, Mother Aa done clear
  C)
  Father aa, Mother AA done clear
  D)
  Father aa, Mother Aa done clear
  View Solution play_arrow

• question_answer62)
  Match the column-I with column-II and choose the correct option._

  	Column-I		Column-II
  A.	Incomplete dominance	I.	Drosophila
  B.	Mendelian disorder	II.	Antirrhinum sp.
  C.	Transforming principle	III.	Griffith
  D.	Dihybrid cross	IV.	Haemophilia

  A)
  A-I;     B-IV;    C-III;    D-II done clear
  B)
  A-IV;   B-II;    C-III;   D-I done clear
  C)
  A-II;     B-III;   C-IV;   D-I done clear
  D)
  A-II;     B-IV;   C-III;    D-I            done clear
  View Solution play_arrow

• question_answer63)
  Which of the following statements are incorrect?

  (i) A dominant allele determines the phenotype when paired with a recessive allele.

  (ii) A recesive allele is weaker than a dominant allele.

  (iii) A recessive allele do not shows its effects when paired with a dominant allele.

  (iv) A dominant allele is always better for an   organism.

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

• question_answer64)
  Which of the following statements are correct? 

  (i) Failure of segregation of chromatids during cell division results in aneuploidy.

  (ii) Chromosomal disorders are mainly determined by alteration or mutation in a single gene.

  (iii) Thalassemia and cystic fibrosis are Mendelian disorders.

  (iv) Sickle cell anaemia is an X-linked trait.

  (v) Haemophilia is an autosome linked recessive disease.

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

• question_answer65)
  Harmful mutations does not get eliminated from gene pool because:
  A)
  they are recessive and carried by homozygous individuals. done clear
  B)
  they are recessive and carried by heterozygous individuals. done clear
  C)
  they are formed repeatedly. done clear
  D)
  they show genetic drift. done clear
  View Solution play_arrow

• question_answer66)
  Which of the following has normal sex chromosomes?
  A)
  Down syndrome done clear
  B)
  Klinefelter syndrome done clear
  C)
  Turner syndrome done clear
  D)
  Super female done clear
  View Solution play_arrow

• question_answer67)
  Haemophilia is mentioned as a trait carried by the mother and passed to her sons. What is the pattern of inheritance for this trait?
  A)
  Haemophilia is an allele carried on one of the mother's autosomal chromosomes. done clear
  B)
  Haemophilia is an allele carried on the Y chromosome because more males have this genetic disorder than females. done clear
  C)
  Haemophilia is an allele carried on the X chromosome and can be directly inherited by the son from the father or the mother. done clear
  D)
  Haemophilia is carried on the X chromosome and can only be inherited by the son if the mother is a carrier. done clear
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• question_answer68)
  Gynandromorphs are animals having:
  A)
  same sex in all cells of the body. done clear
  B)
  different sexes in all cells of the body. done clear
  C)
  same sex in different cells of the body. done clear
  D)
  different sexes in different cells of the body. done clear
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• question_answer69)
  Which of the following is an example of sex- linked inheritance?
  A)
  Anaemia         done clear
  B)
                     Cretinism done clear
  C)
  Night-blindness   done clear
  D)
                     Colour-blindness done clear
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• question_answer70)
  Which of the following is an example for sex-influenced inheritance?
  A)
  Baldness    done clear
  B)
                     Haemophilia done clear
  C)
  Colour blindness done clear
  D)
                     Down's syndrome done clear
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• question_answer71)
  A dihybrid ratio of 1:4:6:4:1 is obtained instead of 9:3:3:l. This is an example of:
  A)
  Complementary genes done clear
  B)
  Supplementary genes done clear
  C)
  Polygenic inheritance done clear
  D)
  Pleiotropic genes done clear
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• question_answer72)
  One child is haemophilic (sex-linked trait), while its fraternal twin brother is normal. Which one of the following informations is most appropriate?
  A)
  The mother must have been heterozygous. done clear
  B)
  The child is a monozygotic twin. done clear
  C)
  The other child is a female and the father is haemophilic. done clear
  D)
  The haemophilic child is a male. done clear
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• question_answer73)
  Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring were analysed. Which of the following statements about this situation is correct?
  A)
  Both parents are homozygotes. done clear
  B)
  The offspring are either all homozygotes or all heterozygotes. done clear
  C)
  The offspring represent the \[{{F}_{1}}\] generation and the gametes produced by the offspring will carry only one allele for this gene. done clear
  D)
  All of the above done clear
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• question_answer74)
  The law of segregation of characters is also. called the law of purity of gametes because:
  A)
  gametes have only one of the two alleles for each character. done clear
  B)
  gametes cannot be contaminated. done clear
  C)
  Both [a] and [b] done clear
  D)
  gametes are very different type of cells. done clear
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• question_answer75)
  According to the law of independent assortment, in a dihybrid cross:       
  A)
  There are four genotypes in \[{{F}_{2}}\] done clear
  B)
  \[{{F}_{2}}\] contains 16 phenotypes. done clear
  C)
  there is a single individual which is homozygous recessive for both the characters. done clear
  D)
  it is not possible to forecast the different phenotypes. done clear
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• question_answer76)
  Match column-I with column-II and select the correct option from the codes given below.

  	Column-I		Column-II
  A.	Autosomal recessive trait	I.	Down?s syndrome
  B.	Sex-linked recessive trait	II.	Phenylketonuria
  C.	Metabolic error linked to autosomal recessive trait	III.	Haemophilia
  D.	Additional 21st chromosome	IV.	Sickle cell anaemia

  A)
  A-II;    B-I;   C-IV;   D-III done clear
  B)
  A-IV;   B-I;   C-II;    D-III done clear
  C)
  A-IV;   B-III; C-II;    D-I done clear
  D)
  A-III;   B-IV; C-I;     D-II done clear
  View Solution play_arrow

• question_answer77)
  Study the pedigree chart given below. What does it show?
  A)
  This pedigree chart is wrong as this is not possible. done clear
  B)
  Inheritance of a recessive sex-linked disease like haemophilia. done clear
  C)
  Inheritance of a sex-linked inborn error of metabolism like phenylketonuria. done clear
  D)
  Inheritance of a condition like phenylketonouria as an autosomal recessive trait. done clear
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• question_answer78)
  Match column-I (Definition) with column-II (Terms) and select the correct option from the codes given below.

  	Column-I		Column-II
  A.	A single trait bontrolled by three or more than three alleles	I.	Pleiotropy
  B.	A single trait controlled by three or more than three genes	II.	Multiple alleles
  C.	A single gene exhibits multiple phenotypic expression	III.	Polygenic inheritance

  A)
  A-II;    B-III;   C-I done clear
  B)
  A-III;   B-II;    C-I done clear
  C)
  A-I;      B-II;   C-III done clear
  D)
  A-II;     B-I;     C-III done clear
  View Solution play_arrow

• question_answer79)
  A mutation is a:   
  A)
  sudden temporary change in an organism's genetic material. done clear
  B)
  change in phenotype followed by a change in genotype. done clear
  C)
  change in hereditary material directed by a changing environment. done clear
  D)
  change in genotype which may result in a new expression of a characteristic. done clear
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• question_answer80)
  Ban- body is found in the nucleus during:
  A)
  interphase in cell of female mammal. done clear
  B)
  interphase in cell of male mammal. done clear
  C)
  prophase in cell of female mammal. done clear
  D)
  prophase in cell of male mammal. done clear
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• question_answer81)
  Blackening of urine when exposed to air is a metabolic disorder in human beings. This is due To:
  A)
  Phenylalamne     done clear
  B)
       Valine replacing glutamine done clear
  C)
  Glutamine replacing valine done clear
  D)
  Homogentisic acid done clear
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• question_answer82)
  In sickle-cell anaemia, shape of RBCs under oxygen tension becomes:
  A)
  Biconcave disc like done clear
  B)
  Elongated and curved done clear
  C)
  Circular done clear
  D)
  Spherical done clear
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• question_answer83)
  If a trait passes from father to all his daughters but none of his sons, the trait is:
  A)
  Autosomal dominant   done clear
  B)
  Autosomal recessive done clear
  C)
  Sex linked dominant                    done clear
  D)
  Sex linked recessive done clear
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• question_answer84)
  In fruit flies, dumpy wings are shorter and broader than normal wings. The allele for normal wings [D] is dominant to the allele for dumpy wings [d]. Seventy five normal-winged and twenty five dumpy-winged flies. The genotype of parents would be.
  A)
  DD and D     done clear
  B)
                     DD and Dd done clear
  C)
  Dd and Dd  done clear
  D)
                     Dd and dd done clear
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• question_answer85)
  How many pairs of contrasting character in pea plants were studied by Mendel in his experiments?
  A)
  Seven         done clear
  B)
                     Eight done clear
  C)
  Five                                          done clear
  D)
  Six done clear
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• question_answer86)
  It is well known that Queen Victoria of England: was a carrier for haemophilia. Since this is an X-linked disease, it can be predicted that:
  A)
  all of her sons would have that disease.   done clear
  B)
  all her daugthers would have been carriers done clear
  C)
  her father must definitely have had haemophilia. done clear
  D)
  haemophilia would have occurred in more other male than her female descendents done clear
  View Solution play_arrow

• question_answer87)
  euteranopia is a disease when there is no perception of which of the following colour?
  A)
  Red                                           done clear
  B)
  Blue done clear
  C)
  White                                        done clear
  D)
  Green done clear
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• question_answer88)
  A genetic disease in many Africans which reduces the oxygen uptake by RBC is known as:
  A)
  Sickle-cell anaemia done clear
  B)
  Anaemia done clear
  C)
  Pernicious anaemia done clear
  D)
  Haemophilia done clear
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• question_answer89)
  Match column-I with column-II and select the correct answer using the codes given below.

  	Column-I		Column-II
  A.	Turner syndrome	I.	Trisomy
  B.	Linkage	II.	AA+XO
  C.	Y-chromosome	III.	Morgan
  D.	Down?s syndrome	IV.	Testis determining factor

  A)
  A-II;    B-I;    C-IV;    D-III done clear
  B)
  A-IV;   B-I;    C-II;     D-III done clear
  C)
  A-IV;    B-II;   C-I;      D-III done clear
  D)
  A-II;     B-III;   C-IV;   D-I done clear
  View Solution play_arrow