NEET Biology Biotechnology And Its Applications Question Bank

done Genetic Variation Total Questions - 103

• question_answer1)
  "Philadelphia chromosome'' is found in the patient suffering from
  A)
  Insomnia done clear
  B)
  Leukaemia done clear
  C)
  Hepatitis done clear
  D)
  Albinism done clear
  View Solution play_arrow

• question_answer2)
  Number of sex chromosomes is normal in [MP PMT 1992]
  A)
  Super female done clear
  B)
  Turner's syndrome done clear
  C)
  Klinefelter's syndrome done clear
  D)
  Down's syndrome done clear
  View Solution play_arrow

• question_answer3)
  Mating between two individuals differing in genotye to produce genetic variation is called [J&K CET 2005]
  A)
  Domestication done clear
  B)
  Introduction done clear
  C)
  Hybridisation done clear
  D)
  Mutation done clear
  View Solution play_arrow

• question_answer4)
  The gene which increases the frequency of mutation in other gene is referred to as
  A)
  Mutator gene done clear
  B)
  Mutagene done clear
  C)
  Hypostatic gene done clear
  D)
  Complementary gene done clear
  View Solution play_arrow

• question_answer5)
  If an albino man marries with a normal woman and 50 offsprings are albino and 50 are normal, the woman is [CPMT 1977; DPMT 1992; MP PMT 1998]
  A)
  Heterozygous normal done clear
  B)
  Homozygous normal done clear
  C)
  Heterozygous carrier done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer6)
  If mother and father both are without pigments (albinism), then
  A)
  All the offsprings will be albinism done clear
  B)
  Half of the offsprings will be albinism done clear
  C)
  75% offsprings will be albinism done clear
  D)
  No offspring will be albinism done clear
  View Solution play_arrow

• question_answer7)
  Traits controlled by genes located on autosomes are said to be [BHU 1985]
  A)
  Sex affected done clear
  B)
  Sex influenced done clear
  C)
  Sex linked done clear
  D)
  Genetic traits done clear
  View Solution play_arrow

• question_answer8)
  Which one in man is a wholly genetic trait [CPMT 1977; AFMC 1985]
  A)
  Diptheria done clear
  B)
  Leucoderma done clear
  C)
  Albinism done clear
  D)
  Tuberculosis done clear
  View Solution play_arrow

• question_answer9)
  Mongolism syndrome is caused by [AFMC 1985, 86]
  A)
  One extra chromosome done clear
  B)
  One extra sex chromosome done clear
  C)
  One extra chromosome in 21st pair done clear
  D)
  One less sex chromosome done clear
  View Solution play_arrow

• question_answer10)
  To be evolutionary successful, a mutation must be [CPMT 1982; AFMC 1985; MP PMT 1996]
  A)
  Germplasm DNA done clear
  B)
  Somatoplasm DNA done clear
  C)
  Cytoplasm done clear
  D)
  RNA done clear
  View Solution play_arrow

• question_answer11)
  In man, albinism is due to non-synthesis of melanin in the absence of [BHU 2003]
  A)
  Lysine done clear
  B)
  Tyrosinase done clear
  C)
  Luciferase done clear
  D)
  Melanase done clear
  View Solution play_arrow

• question_answer12)
  The reason why some mutations which are harmful do not get eliminated from the gene pool, is that[AIIMS 1984]
  A)
  They have future survival value done clear
  B)
  They are recessive and carried by heterozygous individuals done clear
  C)
  They are dominant and show up more frequently done clear
  D)
  Genetic drift occurs because of a small population area done clear
  View Solution play_arrow

• question_answer13)
  An abnormal male child is born to normal parents. This child shows a short neck, stubby hands, slanting eyes, permanently open mouth with projecting upper lip and short stature. This abnormality can be attributed to
  A)
  An extra Y chromosome done clear
  B)
  An extra X chromosome done clear
  C)
  An extra chromosome in the 21st pair of autosomes done clear
  D)
  Absence of X chromosome leading to a total of 45 chromosomes instead of the normal 46 done clear
  View Solution play_arrow

• question_answer14)
  The reduction of one pair of chromosome in human is due to
  A)
  Fusion of two chromosomes into one done clear
  B)
  Elimination done clear
  C)
  Mutation done clear
  D)
  Reproductive isolation done clear
  View Solution play_arrow

• question_answer15)
  Mongoloid condition is related to or In mongolism a patient shows [DPMT 1982; MP PMT 1995; CBSE PMT 2001]
  A)
  Monosomy done clear
  B)
  Trisomy done clear
  C)
  Nullisomy done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer16)
  Which of the following is a genetic disease [CBSE PMT 1990; JIPMER 1993]
  A)
  Phenylketonuria done clear
  B)
  Blindness done clear
  C)
  Cataract done clear
  D)
  Leprosy done clear
  View Solution play_arrow

• question_answer17)
  In Klinefelter's syndrome, what is generally the set of sex chromosome [DPMT 1982; CBSE PMT 1993; CPMT 1994; MP PMT 1994, 98, 2000, 02; AIIMS 2000; Kerala CET 2003; BVP 2003]
  A)
  XX done clear
  B)
  XY done clear
  C)
  XXY done clear
  D)
  XYY done clear
  View Solution play_arrow

• question_answer18)
  Mutation is [MP PMT 1993]
  A)
  Sudden change in morphology done clear
  B)
  Change in characters done clear
  C)
  Change in heritable characters done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer19)
  A person who is trisomic for twenty first pair of chromosomes is [BHU 1990; CPMT 1993, 2000; DPMT 1993;  MP PMT 1993]
  A)
  Klinefelter's syndrome done clear
  B)
  Down's syndrome done clear
  C)
  Turner's syndrome done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer20)
  The monosomic condition in human beings depicted as XO is referred to as [AIIMS 1985, 99; BHU 1983, 85; CPMT 1991; Pb. PMT 2000; JIPMER  2002; MP PMT 2002, 03]
  A)
  Criminal syndrome done clear
  B)
  Down's syndrome done clear
  C)
  Klinefelter's syndrome done clear
  D)
  Turner's syndrome done clear
  View Solution play_arrow

• question_answer21)
  Gene mutation is caused by [CPMT 1973; DPMT 1985; MP PMT 1995;  JIPMER  2001]
  A)
  Reproduction done clear
  B)
  Linkage done clear
  C)
  Change in the sequence of nitrogenous base done clear
  D)
  Change in the sequence of genes in DNA done clear
  View Solution play_arrow

• question_answer22)
  The number of chromosomes in Turner's syndrome is [MP PMT 1990; CBSE PMT 1993]
  A)
  45 done clear
  B)
  43 done clear
  C)
  44 done clear
  D)
  42 done clear
  View Solution play_arrow

• question_answer23)
  Which of the following disorders is not hereditary [J&K CET 2005]
  A)
  Haemophilia done clear
  B)
  Cataract done clear
  C)
  Sickle-cell anaemia done clear
  D)
  Colour blindness done clear
  View Solution play_arrow

• question_answer24)
  Disorders of amino acid metabolism results in [CBSE PMT 1993]
  A)
  Alkaptonuria done clear
  B)
  Phenylketonuria done clear
  C)
  Albinism done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer25)
  Genotype of a Down's syndrome is [BHU 1986; AIIMS 1993]
  A)
  45 + XX done clear
  B)
  44 + XY done clear
  C)
  44 + XXY done clear
  D)
  22 + XY done clear
  View Solution play_arrow

• question_answer26)
  The point mutations A to G, C to T, C to G and T to A in DNA are [JIPMER 1993]
  A)
  Transition, transition, transversion and transversion respectively done clear
  B)
  Transition, transversion, transition and transversion respectively done clear
  C)
  Transversion, transversion, transition and transition respectively done clear
  D)
  All four are transition done clear
  View Solution play_arrow

• question_answer27)
  Albinism is [CPMT 1977]
  A)
  Hereditary character done clear
  B)
  Non-hereditary character done clear
  C)
  Sex-linked character done clear
  D)
  Acquired character done clear
  View Solution play_arrow

• question_answer28)
  Turner's syndrome is [BHU 1986; CPMT 1994; MP PMT 1994, 98]
  A)
  XO done clear
  B)
  XX done clear
  C)
  XY done clear
  D)
  XYY done clear
  View Solution play_arrow

• question_answer29)
  The number of chromosomes in Down's syndrome is [CPMT 1983; CBSE PMT 2005; AFMC 2005; MP PMT 2005]
  A)
  23rd pair with one less = 45 done clear
  B)
  21st pair with one more = 47 done clear
  C)
  17th pair with one more = 47 done clear
  D)
  One extra sex chromosome = 47 done clear
  View Solution play_arrow

• question_answer30)
  The concept of sudden genetic change which breeds true in an organism is visualised in the principle of [NCERT 1976]
  A)
  Natural selection done clear
  B)
  Heredity done clear
  C)
  Variations done clear
  D)
  Mutations done clear
  View Solution play_arrow

• question_answer31)
  A man having Klinefelter's syndrome is [J&K CET 2005; MP PMT 2005]
  A)
  Intersex with secondary sexual characters on the side of female done clear
  B)
  Male with secondary sexual characters of female done clear
  C)
  Female with secondary sexual characters of male done clear
  D)
  Normal fertile male done clear
  View Solution play_arrow

• question_answer32)
  A man homozygous for brown colour marries a lady heterozygous for brown colour is dominant. What will be the fate of their children [BHU 1986]
  A)
  All brown done clear
  B)
  Three brown done clear
  C)
  Two brown done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer33)
  Edward's syndrome, Patau's syndrome and Down's syndrome are due to [DPMT 1983; MP PMT 1997, 2003; CPMT 1999; Orissa JEE 2005]
  A)
  Mutation due to malnutrition done clear
  B)
  Change in sex chromosomes done clear
  C)
  Change in autosomes done clear
  D)
  Change in both sex chromosomes and autosomes done clear
  View Solution play_arrow

• question_answer34)
  An albino lady marries a normal man having one gene for albinism. They have 3 daughters and 1 son. The son will be
  A)
  Normal done clear
  B)
  Either normal or albino done clear
  C)
  Half normal half albino done clear
  D)
  Normal in childhood but turns albino on becoming adult done clear
  View Solution play_arrow

• question_answer35)
  A pleiotropic gene is one which
  A)
  Affects one character done clear
  B)
  Affects more than one characters done clear
  C)
  (a) and (b) both done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer36)
  Symptoms representing a particular disease due to chromosomal abnormalities are referred to
  A)
  Sex mosaic done clear
  B)
  Syndrome done clear
  C)
  Lethal done clear
  D)
  Pedigree done clear
  View Solution play_arrow

• question_answer37)
  Mutations occur
  A)
  Mainly in haploid cells done clear
  B)
  Mainly in diploid cells done clear
  C)
  Whenever cells are exposed to X-rays done clear
  D)
  In any cell of the body exposed to radiation done clear
  View Solution play_arrow

• question_answer38)
  What would be the number of chromosomes in the ovum (fertilized by a normal sperm) that resulted in the appearance of Klinefelter's syndrome in the offspring [MP PMT 1990]
  A)
  23 done clear
  B)
  22 done clear
  C)
  21 done clear
  D)
  24 done clear
  View Solution play_arrow

• question_answer39)
  Condition of sex chromosomes in a male child of Down's syndrome will be [CBSE PMT 1991]
  A)
  XY done clear
  B)
  XXY done clear
  C)
  XX done clear
  D)
  XO done clear
  View Solution play_arrow

• question_answer40)
  Trisomic condition of Down's syndrome arises due to [CBSE PMT 1991; MP PMT 2003]
  A)
  Triploidy done clear
  B)
  Translocation done clear
  C)
  Non-disjunction done clear
  D)
  Dicentric bridge formation done clear
  View Solution play_arrow

• question_answer41)
  An example of a disease of molecular mutation is [MP PMT 1994]
  A)
  Erythroblastosis fetalis done clear
  B)
  Haemophilia done clear
  C)
  Anaemia done clear
  D)
  Sickle-cell anemia done clear
  View Solution play_arrow

• question_answer42)
  Hugo de Vries formulated the "Mutation Theory" based on the experiments he conducted on [MP PMT 1994]
  A)
  Althea rosea done clear
  B)
  Pisum sativum done clear
  C)
  Drosophila melanogaster done clear
  D)
  Oenothera lamarckiana done clear
  View Solution play_arrow

• question_answer43)
  A hereditary disease which is never passed on from father to son is [J&K CET 2005]
  A)
  Autosomal linked disease done clear
  B)
  X-chromosomal linked disease done clear
  C)
  Y-chromosomal linked disease done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer44)
  Continuous variations are attributed to
  A)
  Chromosomal aberrations done clear
  B)
  Polyploidy done clear
  C)
  Mutations done clear
  D)
  Crossing over done clear
  View Solution play_arrow

• question_answer45)
  In Drosophila, gene for white eye mutation is also responsible for depigmentation of body parts. Thus a gene that controls several phenotypes is called [Kerala CET 2005]
  A)
  Oncogene done clear
  B)
  Epistatic gene done clear
  C)
  Hypostatic gene done clear
  D)
  Pleiotropic gene done clear
  E)
  Sex-linked gene done clear
  View Solution play_arrow

• question_answer46)
  The functional unit of mutation is [JIPMER 1994; MP PMT 1994; AFMC 1995]
  A)
  Gene done clear
  B)
  Muton done clear
  C)
  Recon done clear
  D)
  Cistron done clear
  View Solution play_arrow

• question_answer47)
  The most striking example of point mutation is found in a disease called [CBSE PMT 1995]
  A)
  Night blindness done clear
  B)
  Thalassemia done clear
  C)
  Down's syndrome done clear
  D)
  Sickle-cell anaemia done clear
  View Solution play_arrow

• question_answer48)
  An abnormal human male phenotype involving an extra X chromosome (XXY) is a case of [CBSE PMT 1995; CPMT 1996; MP PMT 1997, 2004]
  A)
  Down's syndrome done clear
  B)
  Intersex done clear
  C)
  Edward syndrome done clear
  D)
  Klinefelter syndrome done clear
  View Solution play_arrow

• question_answer49)
  Which of the following is not related to chromosomal aberration [MP PMT 1995]
  A)
  Euploidy done clear
  B)
  AIDS done clear
  C)
  Aneuploidy done clear
  D)
  Klinefelter's syndrome done clear
  View Solution play_arrow

• question_answer50)
  Point mutation is a change which involves [MP PMT 1995]
  A)
  Loss of a gene done clear
  B)
  Addition of a gene done clear
  C)
  Deletion of a segment of a gene done clear
  D)
  Change in a base of a gene done clear
  View Solution play_arrow

• question_answer51)
  The frequency of a mutant gene in a population is expected to increase, if the gene is [CBSE PMT 1994]
  A)
  Recessive done clear
  B)
  Dominant done clear
  C)
  Sex linked done clear
  D)
  Favourably selected done clear
  View Solution play_arrow

• question_answer52)
  Albinism is a congenital disorder resulting from the lack of the enzyme [CBSE PMT 1994]
  A)
  Catalase done clear
  B)
  Fructokinase done clear
  C)
  Tyrosinase done clear
  D)
  Xenthine oxidase done clear
  View Solution play_arrow

• question_answer53)
  Sometimes chromosome number increase or decrease due to [AFMC 1996]
  A)
  Non-disjunction of chromosome done clear
  B)
  Genetic repete done clear
  C)
  Mutation done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer54)
  A person who has 47 chromosomes due to an extra X chromosome is affected by [CPMT 1995; CBSE PMT 1996; MP PMT 2003]
  A)
  Turner's syndrome done clear
  B)
  Klinefelter's syndrome done clear
  C)
  Super female done clear
  D)
  Down's syndrome done clear
  View Solution play_arrow

• question_answer55)
  Mutations are responsible for
  A)
  Increasing the population rate done clear
  B)
  Variations in organisms done clear
  C)
  Constancy in organisms done clear
  D)
  For beneficial changes in organisms done clear
  View Solution play_arrow

• question_answer56)
  Edward syndrome is on account of....... [MP PMT 1994, 99, 2000, 04]
  A)
  45 chromosomes instead of 46 done clear
  B)
  Presence of three chromosomes on 18th pair of autosome done clear
  C)
  Presence of three chromosomes on 21st pair of autosome done clear
  D)
  Presence of three pair of sex chromosomes done clear
  View Solution play_arrow

• question_answer57)
  The cause of Turner's syndrome in man is
  A)
  Incomplete sex linkage done clear
  B)
  Sex-linked inheritance done clear
  C)
  Autosomal abnormality done clear
  D)
  Sex-chromosomal abnormality done clear
  View Solution play_arrow

• question_answer58)
  In man the mutation disease 'Aniridia' (Congenital absence of iris) occurs due to
  A)
  Recessive mutation done clear
  B)
  Dominant mutation done clear
  C)
  Lethal mutation done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer59)
  Phenyketonuria is a genetic disorder of [Kerala CET 2005]
  A)
  Trisomic condition done clear
  B)
  Monosomic condition done clear
  C)
  Autosomal dominant gene done clear
  D)
  Autosomal recessive gene done clear
  E)
  X-linked done clear
  View Solution play_arrow

• question_answer60)
  Height is [CPMT 2005]
  A)
  Somatogenic variation done clear
  B)
  Discontinuous variation done clear
  C)
  Continuous variation done clear
  D)
  Blastogenic variation done clear
  View Solution play_arrow

• question_answer61)
  Which one of the following is not a mutagen [MP PMT 1995, 97; 2000]
  A)
  Ethyl methane sulphonate done clear
  B)
  Acetic acid done clear
  C)
  Nitrous acid done clear
  D)
  Ethylene oxide done clear
  View Solution play_arrow

• question_answer62)
  Mutation rates are affected by [MP PMT 1997]
  A)
  Temperature done clear
  B)
  X-rays done clear
  C)
  Gamma and beta radiation done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer63)
  A mutation is most likely to have a selective advantage in evolution if [CPMT 2005]
  A)
  It affects dominant genes done clear
  B)
  It affects recessive genes done clear
  C)
  It affects whole chromosomes done clear
  D)
  The environment remains stable done clear
  View Solution play_arrow

• question_answer64)
  In Down's syndrome (Mongolism) each cell has how many chromosomes [MP PMT 1998]
  A)
  \[{{21}^{st}}\]pair having one less done clear
  B)
  \[{{23}^{rd}}\]pair with one less done clear
  C)
  45 done clear
  D)
  47 done clear
  View Solution play_arrow

• question_answer65)
  Which of the following is not X-linked recessive [AMU 2005]
  A)
  Haemophilia-A done clear
  B)
  Colour blindness done clear
  C)
  \[\beta -\]Thalasemia done clear
  D)
  G-6 PD deficiency done clear
  View Solution play_arrow

• question_answer66)
  Gynaecomastia is the symptom of [DPMT 2004]
  A)
  Down syndrome done clear
  B)
  SARS done clear
  C)
  Turner's syndrome done clear
  D)
  Klinefelter's syndrome done clear
  View Solution play_arrow

• question_answer67)
  Which of the following is the main category of mutation [CBSE PMT 1999]
  A)
  Genetic mutation done clear
  B)
  Zygotic mutaion done clear
  C)
  Somatic mutaion done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer68)
  In human beings, multiple genes are involved in the inheritance of [CBSE PMT 1999]
  A)
  Colourblindness done clear
  B)
  Phenylketonuria done clear
  C)
  Sickle-cell anaemia done clear
  D)
  Skin colour done clear
  View Solution play_arrow

• question_answer69)
  The formation of multivalents at meiosis in diploid organism is due to [CBSE PMT 1998]
  A)
  Monosomy done clear
  B)
  Inversion done clear
  C)
  Deletion done clear
  D)
  Reciprocal translocation done clear
  View Solution play_arrow

• question_answer70)
  Mental retardation in man, associated with sex chromosomal abnormality is usually due to [CBSE PMT1998]
  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_answer71)
  The reason of fault in gene duplication is [RPMT PMT 1999]
  A)
  Transformation done clear
  B)
  Translocation done clear
  C)
  Mutation done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer72)
  If haploid chromosome number in a cell is 12. The monosomic number will be [MP PMT 1997, 2000]
  A)
  24 done clear
  B)
  21 done clear
  C)
  25 done clear
  D)
  23 done clear
  View Solution play_arrow

• question_answer73)
  Normally DNA molecule has A-T, G-C pairing. However, these bases can exist in alternative valency status, owing to rearrangements called [BHU 2000]
  A)
  Point mutation done clear
  B)
  Analogue substitution done clear
  C)
  Frame-shift mutation done clear
  D)
  Tautomerisational mutation done clear
  View Solution play_arrow

• question_answer74)
  Who reported that Down's syndrome is due to extra 21st chromosome    [BVP 2000]
  A)
  J.L. Down (1866) done clear
  B)
  Lejeune (1959) done clear
  C)
  Kinefelter (1942) done clear
  D)
  Huntington (1872) done clear
  View Solution play_arrow

• question_answer75)
  Mutation caused by a mutagen is  [BVP 2001]
  A)
  Natural done clear
  B)
  Chemical done clear
  C)
  Spontaneous done clear
  D)
  Induced done clear
  View Solution play_arrow

• question_answer76)
  Discontinuous variations are [AIIMS 2001]
  A)
  Mutations done clear
  B)
  Acquired characters done clear
  C)
  Essential features done clear
  D)
  Nonessential features done clear
  View Solution play_arrow

• question_answer77)
  Epicanthus is the symptom of [KCET  2001]
  A)
  Haploidy done clear
  B)
  Heteroploidy done clear
  C)
  Turner?s syndrome done clear
  D)
  Down?s syndrome done clear
  View Solution play_arrow

• question_answer78)
  Alkaptonuria is caused due to [JIPMER 2002]
  A)
  Dominant autosomal gene done clear
  B)
  Recessive autosomal gene done clear
  C)
  X linked recessive gene done clear
  D)
  X linked dominant gene done clear
  View Solution play_arrow

• question_answer79)
  A person may have one gene for normal haemoglobin and one gene for sickle cell haemoglobin. This heterozygous condition is called [BHU 2002]
  A)
  Genome done clear
  B)
  Anaemia done clear
  C)
  Gene trait done clear
  D)
  Sickle cell trait done clear
  View Solution play_arrow

• question_answer80)
  If a diploid cell is treated with colchicine, then it becomes [CBSE PMT 2002]
  A)
  Tetraploid done clear
  B)
  Diploid done clear
  C)
  Triploid done clear
  D)
  Monoploid done clear
  View Solution play_arrow

• question_answer81)
  Which one of the following mutation partially or fully reverses the harmful effects of previous mutation [MP PMT 2002]
  A)
  Indirect suppression done clear
  B)
  Intergenic mutation done clear
  C)
  Intragenic mutation done clear
  D)
  Suppressor mutation done clear
  View Solution play_arrow

• question_answer82)
  Polydactyly in man is due to [J & K CET  2002]
  A)
  Autosomal dominant gene done clear
  B)
  Autosomal recessive gene done clear
  C)
  Sex-linked dominant gene done clear
  D)
  Sex-linked recessive gene done clear
  View Solution play_arrow

• question_answer83)
  The number of chromosomes in Klinefelter?s syndrome is   [CPMT 1995; MP PMT 2003; DPMT 2004]
  A)
  47 (44 + XXY) done clear
  B)
  47 (44 + XXX) done clear
  C)
  47 (46 + 1 chromosome 21) done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer84)
  Philadelphia chromosome is   [MH CET 2002]
  A)
  13th chromosome done clear
  B)
    22nd chromosome done clear
  C)
  17th chromosome done clear
  D)
  21st chromosome done clear
  View Solution play_arrow

• question_answer85)
  Which pair of chromosomes is concerned with Down's syndrome [MP PMT 1992; CBSE PMT 2002; CPMT 2002; BVP 2002; MH-CET 2002; DPMT 2003]
  A)
  7th done clear
  B)
  18th done clear
  C)
  21st done clear
  D)
  23rd done clear
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• question_answer86)
  The condition in which there are more than two complete set of chromosome is called [MP PMT 2003]
  A)
  Polytene done clear
  B)
  Monoploidy done clear
  C)
  Polyploidy done clear
  D)
  Aneuploidy done clear
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• question_answer87)
  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 [CBSE PMT 2003]
  A)
  25% done clear
  B)
  100% done clear
  C)
  75% done clear
  D)
  50% done clear
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• question_answer88)
  Monosomy and trisomy can be represented as [DPMT 2003]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer89)
  Given below is the representation of a kind of chromosomal mutation What is the kind of mutation represented [AFMC 1997; AIIMS 2004]
  A)
  Deletion done clear
  B)
  Duplication done clear
  C)
  Inversion done clear
  D)
  Reciprocal translocation done clear
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• question_answer90)
  Which is correct about white tiger  [Orissa JEE 2004]
  A)
  White tiger is recessive mutant done clear
  B)
  It is part of subspecies of India tiger done clear
  C)
  It is a type of albino done clear
  D)
  It is a transgenic animal done clear
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• question_answer91)
  A recessive mutant is one which [Orissa JEE 2004]
  A)
  Is not expressed done clear
  B)
  Is rarely expressed done clear
  C)
  Is expressed only in homozygous and hemixygous state done clear
  D)
  Is expresesed only in heterozygous state. done clear
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• question_answer92)
  Frequency of Down's syndrome increases when the maternal age is [Orissa JEE 2004]
  A)
  Above 35 years done clear
  B)
  Below 35 years done clear
  C)
  During 1st pregnancy done clear
  D)
  In mothers of at least 3 children done clear
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• question_answer93)
  The amino acid substituted in sickle cell anaemia is  [Kerala CET 2004, 05]
  A)
  Glutamic acid for valine in the alpha chain done clear
  B)
  Glutamic acid for valine in the beta chain done clear
  C)
  Valine for glutamic acid in the alpha chain done clear
  D)
  Valine for glutamic acid in the beta chain done clear
  E)
    None of these done clear
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• question_answer94)
  Phenylketonuria is a genetic disorder due to a defect in metabolism of the following.  [Kerala PMT 2004]
  A)
  Polysaccharides done clear
  B)
  Fatty acids done clear
  C)
  Vitamins done clear
  D)
    Amino acids done clear
  E)
  Hormones done clear
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• question_answer95)
  Turner's syndrome is an example of [Kerala PMT 2004]
  A)
  Monosomy done clear
  B)
  Bisomy done clear
  C)
  Trisomy done clear
  D)
  Polyploidy done clear
  E)
  Translocation done clear
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• question_answer96)
  In man, which of the following genotypes and phenotypes may be the correct result of aneuploidy in sex chromosomes   [CPMT 2004]
  A)
  22 pairs + XXY males done clear
  B)
  22 pairs + XX females done clear
  C)
  22 pairs + XXXY females done clear
  D)
  22 pairs + Y females done clear
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• question_answer97)
  The "cri-du-chat" syndrome is caused by change in chromosome structure involving [AIIMS 2005]
  A)
  Deletion done clear
  B)
  Duplication done clear
  C)
  Inversion done clear
  D)
  Translocation done clear
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• question_answer98)
  Somaclonal variation appears in [AIIMS 2005]
  A)
  Organism produced through somatic hybridization done clear
  B)
  Plants growing in highly polluted conditions done clear
  C)
  Apomictic plants done clear
  D)
  Tissue culture raised plants done clear
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• question_answer99)
  Which one of the following is a dominant trait
  A)
  Albinism done clear
  B)
  Sickle cell anaemia done clear
  C)
  Phenylketonuria done clear
  D)
  Polydactyly done clear
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• question_answer100)
  Turner's syndrome in human is caused by [CPMT 1990]
  A)
  Autosomal aneuploidy done clear
  B)
  Sex chromosome aneuploidy done clear
  C)
  Polyploidy done clear
  D)
  Point mutation done clear
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• question_answer101)
  In order to determine whether variations of a character in a population were genetically controlled, the most appropriate procedure will be to
  A)
  Count chromosomes and find out the variations in number in the population done clear
  B)
  Examine DNA and see if the population shows any variation done clear
  C)
  Measure the variations and see if they are continuous or discontinuous done clear
  D)
  Cross individuals of both extremes and see if the offsprings and parents show the range of variations done clear
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• question_answer102)
  Mutations are
  A)
  Changes which are not inherited done clear
  B)
  Changes which are inherited done clear
  C)
  Changes which may or may not be inherited done clear
  D)
  Changes acquired by organisms during their life time done clear
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• question_answer103)
  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 [CBSE PMT 1998]
  A)
  100% done clear
  B)
  25% done clear
  C)
  50% done clear
  D)
  75% done clear
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