NEET Biology Chapter Wise Mock Test – Genetics
1. All genes located on the same chromosome
(a) form different groups depending upon their relative distance
(b) form one linkage group
(c) will not from any linkage groups
(d) form interactive groups that affect the phenotype
2. Phenotype of an organism is the result of
(a) mutations and linkages
(b) cytoplasmic effects and nutrition
(c) environmental changes and sexual dimorphism
(d) genotype and environment interactions
3. Which of the following is correct?
(a) There will be no independent assortment in the presence of linkage
(b) There will be no segregation in the presence of linkage
(c) There will be no dominance irv,the presence of linkage
(d) There will be no crossing over in the presence of dominance
4. 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 expect phenotypes in the F2-generation of the cross RRYY xrryy?
(a) Only round seeds with green cotyledons
(b) Only wrinkled seeds with yellow cotyledons
(c) Only wrinkled seeds with green cotyledons
(d) Round seeds with yellow cotyledons and wrinkled seeds with green cotyledons
5. A cross between two tall plants resulted in offspring having few dwarf plants.. What would be the genotypes of both the parents?
(a) TT and Tt
(b) Tt and Tt
(c) TT and TT
(d) Tt and tt
6. 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
(b) AaBb
(c) AABB
(d) aabb
7. One of the parents of a cross has mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in
(a) one-third of the progenies
(b) none of the progenies
(c) all of the progenies
(d) 50% of the progenies
8. A male human is heterozygous for autosomal genes A and B; and is also hemizygous for haemophilic gene h. What proportion of his sperms will be abh?
9. In a 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 that is rrtt
(a) 25% will be tall with red fruit
(b) 50% will be tall with red fruit
(c) 75% will be tall with red fruit
(d) all of the offsprings will be tall with red fruit
10. Mendel developed his basic principles of heredity by
(a) microscopic study of chromosomes and genes
(b) mathematical analysis of the offsprings of pea plants
(c) breeding experiments with Drosophila
(d) ultracentrifugation studies of cell organelles
11. In pea plants, the long-stem trait (L) is dominant and the short-stem trait is recessive. Two pea plants were crossed, producing seeds that yielded 165 long-stem plants and 54 short-stem plants. The genotypes of the parent plants were most likely
(a) LI and LL
(b) LI and Li
(c) II and II
(d) LL and II
12. In a dihybrid cross, if you get 9 : 3 : 3 : 1 ratio, it denotes that
(a) the alleles of two genes are interacting with each other
(b) it is a multigenic inheritance
(c) it is a case of multiple allelism
(d) the alleles of two genes are segregating independently
13. Pea plants heterozygous for both height and colour of seed coat (TtYy) were crossed with pea plants that were homozygous recessive for both traits (ttyy). The offsprings from this cross . included tall plants with green seeds tall plants with yellow seeds, short plants with green seeds and short plants with yellow seeds. This cross best illustrates
(a) gene mutation
(b) independent assortment of chromosomes
(c) environmental influence on heredity
(d) intermediate inheritance
14. In racoons, a dark face mask is dominant over a bleached face mask. Several crosses were made between racoons that were heterozygous for dark face mask and racoons that were homozygous for bleached face mask. What percentage of the offsprings would be expected to have a dark face mask?
(a) 0%
(b) 50%
(c) 75%
(d) 100%
15. When two heterozygous tall plants are crossed, some short plants appear in the offsprings. The appearance of these short plants illustrates
(a) segregation
(b) intermediate inheritance
(c) crossing-over
(d) codominant inheritance
16. A human male produces sperms with the genotypes AB, Ab, aB and ab pertaining to two dialtelic characters in equal proportions. What is the corresponding genotype of this person?
(a) AaBb
(b) AaBB
(c) AABb
(d) AABB
17. In a given plant, red colour (R) of fruit is dominant over white fruit (r); and tallness (T) is dominant over dwarfnpss (t). If a plant with genotype RRTt, is crossed with plant of genotype rrtt, what will be the percentage of tall plants with red fruits in the next generation?
(a) 100%
(b) 25%
(c) 50%
(d) 75%
18. A common test to find the genotype of a hybrid is by
(a) crossing of one F2 progeny with male parent
(b) crossing of one F2, progeny with female parent
(c) studying the sexual behaviour of F, progenies
(d) crossing of one F, progeny with recessive parent
19. In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in Frgeneration?
(a) 50:50
(b) 9 : 1
(c) 1 : 3
(d)3 : 1
20. If Mohan has 6 girls, the percentage of probability of 7th child to be girl is
(a) 25%
(b) 50%
(c) 75%
(d) 100%
21. Inheritance of ABO blood group shows
(a) polyploidy
(b) incomplete dominance
(c) multiple allelism
(d) polygeny
22. A normal woman whose father was colourblind, is married to a normal man. The sons would be
(a) 75% colourblind
(b) 50% colourblind
(c) all normal
(d) all colourblind
23. Two genes situated very close on the chromosome show
(a) hardly any crossing over
(b) high crossing over
(c) no crossing over
(d) only double crossing over
24. In the ABO system of blood groups, if both antigens are present but no antibody, the blood group of the individual would be
(a) B
(b) O
(c) AB
(d) A
25. A man has blood group A. His wife has blood group B. Their children can have blood group
(a) AB
(b) A or B
(c) A or B or AB
(d) A or B or AB or O
26. Interaction of epistatic genes shows the ratio
(a) 9 : 6 : 1
(b) 13 : 3
(c) 12 : 3 : 1
(d) 15 : 1
27. The mating of two curly-haired brown guinea pigs results in some offsprings with brown curly hair, some with brown straight hair, some with white curly hair and even some with white straight hair. This mating illustrates, which of Mendel’s laws?
(a) Dominance
(b) Segregation
(c) Independent assortment
(d) Sex-linkage
28. A person with blood group A has
(a) antigen A and antibody b
(b) antigen B and antibody a
(c) Both antibodies
(d) no antibody and no antigen
29. In guinea pigs, black.fur (B) is dominant over white fur
(b) and rough fur (R) is dominant over smooth fur (r). A cross between two guinea pigs hybrid for both traits (BbRr x BbRr) produces some offsprings that have rough, black fur and some that have smooth, black fur. The genotypes of these offsprings illustrate the genetic concept of
(a) intermediate inheritance
(b) multiple alleles
(c) independent assortment
(d) codominance
30. How many different types of gametes can be formed by F! progeny, resulting from the following cross?
AA BB CC x aa bb cc
(a) 3
(b) 8
(c) 27
(d) 64
31. Inheritance of skin colour in humans is an example of
(a) chromosomal aberration
(b) point mutation
(c) polygenic inheritance
(d) codominance
32. The father has blood group AB and mother O. The child is supposed to have, which of the following blood groups?
(a) B only
(b) A only
(c) B or 0
(d) A or B
33. Which one pair of parents out of the following is most likely get a child, who would suffer from haemolytic disease of the new-born?
(a) Rh+ mother and Rh~ father
(b) Rh“ mother and Rh“ father
(c) Rh+ mother and Rh+ father
(d) Rff mother and Rh+ father
34. Which of the following gametes are produced by individual with genotype AaBb?
(a) Aa, Bb
(b) AB, ab
(c) AB, Ab, aB, ab
(d) AB, Aa, Bb, ab
35. Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F2-generation, what of offsprings proportion is likely to resemble either parent?
(a) Half
(b) Less than 5%
(c) One-third
(d) None of the above
36. Distance between the genes and percentage of recombination shows
(a) a direct relationship
(b) an inverse relationship
(c) a parallel relationship
(d) no relationship
37. 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 .
(b) Y-chromosome is female determining in Drosophila
(c) Y-chromosome is male determining ip human beings
(d) Y-chromosome has no role in sex determination either in Drosophila or in human beings
38. Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridised, then F2-segregation will show
(a) higher number of the recombinant types
(b) segregation in the expected 9 : 3 : 3 : 1 ratio
(c) segregation in 3 : 1 ratio
(d) higher number of the parental types
39. If the sequence of genes on a chromosome is changed from ABCDEFG to ABCDFEG, then it is
(a) addition
(b) deletion
(c) substitution
(d) inversion
40. 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%
(b) 25%
(c) 100%
(d) 75%
41. How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
(a) Three
(b) Four
(c) Nine
(d) Two
42. Cri-du-chat syndrome in humans is caused by the
(a) fertilisation of an XX egg by a normal Y-bearing sperm
(b) loss of half of the short arm of chromosome 5
(c) loss of half of the long arm of chromosome 5 ^.
(d) trisomy of 21st chromosome
43.Lelf a colourblind woman marries a normal visioned man, their sons will be
(a) all normal visioned
(b) one-half colourblind and one-half normal
(c) three-fourths colourblind and one-fourth normal
(d) all colourblind
44. In which mode of inheritance do you expect more maternal influence among the offsprings?
(a) Autosomal
(b) Cytoplasmic
(c) Y-linked
(d) X-linked
45. When normal and mutan t alleles are present on opposite chromosomes of homologous pair, the heterozygotes are called as
(a) cis heterozygote
(b) homologous heterozygote
(c) trans heterozygote
(d) None of these
46. Sickle-cell anaemia has not been eliminated from the African population because
(a) it is controlled by recessive genes
(b) it is not a foetal disease
(c) it provides immunity against malaria
(d) it is controlled by dominant genes
47. Crossing over is the exchange of parts of chromosomes between two non-sister chromatids. Crossing over in diploid organism is responsible for
(a) linkage between genes
(b) recombination of genes
(c) segregation of alleles
(d) dominance of genes
48. After examining the blood groups of husband and wife, the doctor advised them not to have more than one child, the blood groups of the couple are likely to be
(a) male Rh“ and female Rh+
(b) female Rh“ and male Rh+
(c) male Rh+ and female Rh+
(d) male Rfr and female RIT
49. The two eukaryotic organelles responsible for cytoplasmic inheritance are
(a) lysosomes and mitochondria
(b) chloroplasts and lysosomes
(c) mitochondria and chloroplasts
(d) mitochondria and Golgi complex
50. Crossing over occurs between
(a) sister chromatids
(b) non-sister chromatids
(c) non-homologous chromosomes
(d) All of the above
51. What type of sex determination is seen in butterflies?
(a) XX-XY type
(b) ZO-ZZ type
(c) XX-XO type
(d) ZW-ZZ type
52. If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is
(a) autosomal dominant
(b) autosomal recessive
(c) sex-linked dominant
(d) sex-linked recessive
53. A woman with normal vision, but whose father was colourblind marries a colourblind man. Suppose that the fourth child of this couple was a boy. This boy
(a) must have normal colour vision
(b) will be partially colourblind, since he is heterozygous for the colourblind mutant allele
(c) must be colourblind
(d) may be colourblind or may be of normal vision
54. Mating of an organism to a double recessive in order to determine whether if is homozygous or heterozygous for a character under consideration is called
(a) reciprocal cross
(b) test cross
(c) dihybrid cross
(d) back cross
55. Number of X-chromosomes in Turner’s syndrome is
(a) 3
(b) 2
(c) 1
(d) zero
56. In sickle-cell anaemia glutamic acid is replaced by
valine. Which one of the following triplets codes for valine? [NCERT Exemplar]
(a) G G G
(b) A A G
(c) G A A
(d) G U G
57. Man is hemizygous for
(a) X-chromosome
(b) A-chromosome
(c) B-chromosome
(d) E-chromosome
58. Individuals with patches of other sex are called
(a) gynandromorph
(b) androgynanas
(d) andromorphs
(d) gynomorph
59. Recessive mutations are expressed in
(a) homozygous condition
(b) heterozygous condition
(c) next generation
(d) same generation
60.Given below is a highly simplified representation of the human sex chromosomes from a karyotype. The genes ‘a’ and ‘b’ could be of
(a) colour blindness and body height
(b) attached ear lobe and Rhesus blood group
(c) haemophilia and red-green colour blindness
(d) phenylketonuria and haemophilia
61. Haemophilia is more commonly seen in human males than in human females because
(a) this disease is due to an X-linked dominant mutation
(b) a greater proportion of girls die in infancy
(c) this disease is due to an X-linked recessive mutation
(d) this disease is due to a Y-linked recessive mutation
62. Genes located on Y-chromosomes are called
(a) holandric genes ‘
(b) autosomal genes
(c) sex-linked genes
(d) mutant genes
63. A woman with 47 chromosomes due to three copies of chromosome 21 is characterised by
(a) Down’s syndrome
(b) Triploidy .
(c) Turner’s syndrome
(d) Super femaleness
64. Person having genotype lA lB would show the blood group as AB. This is because of
(a) pleiotropy
(b) codominance
(c) segregation
(d) incomplete’dominance
65. Which one of the following pairs of features is a good example of polygenic inheritance?
(a) Human height and skin colour
(b) ABO blood group in humans and flower colour of Mirabilis jalapa
(c) Hair pigment of mouse and tongue rolling in humans
(d) Human eye colour and sickle-cell anaemia
66. Crossing over that results in genetic recombination in higher organism occurs between
(a) sister chromatids of bivalent
(b) non-sister chromatids of a bivalent
(c) two daughter nuclei
(d) two different bivalents
67. Given below is a pedigree chart showing the inheritance of a certain sex-linked trait in humans.
68.Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to the
(a) repulsion
(b) recombination
(c) linkage
(d) crossing over
69.Primary source of allelic variation is
(a) independent assortment
(b) recombination
(c) mutation
(d) polyploidy
70.In a dihybrid cross, two recessive genes showed 10% recombinants. The distance between two genes is
(a) 20 map units
(b) 10 map units
(c) 30 map units
(d)40 map units
71. The recessive genes humans are always
(a) lethal
(b) sub-iethal
(c) expressed in males
(d) expressed in females
72. In a mutational event, whep adenine is replaced by guanine, it is the case of
(a) frame-shift mutation
(b)transcription
(c) transition
(d)transversion
73.Which cross would best illustrate Mendel’s law of segregation?
(a)TTxtt
(b)Hhxhh
(c)BbxBb
(d)rrxrr
74. Number of chromosomes in Down’s syndrome is
(a) 46
(b) 47
(c) 48
(d) 49
75. The cri-du-chat syndrome is caused by change in chromosome structure involving
(a) deletion
(b) duplication
(c) inversion
(d) translocation
76. If heterozygous round seeded pea plants are self-pollinated the offsprings will be
(a) 75% round
(c) 50% heterozygous
(c) 25% wrinkled
(d) All of these
77. Extranuclear inheritance is a consequence of presence of genes in
(a) mitochondria and chloroplasts
(b) endoplasmic reticulum and mitochondria
(c) ribosomes and chloroplasts
(d) lysosomes and ribosomes
78. Given below is a pedigree chart of a family with five children. It shows the inheritance of attached ear-lobes as opposed to the free ones. The squares represent the male individuals and circles the female individuals. Which one of the following conclusions drawn is correct?
(a) frame-shift mutation
(b)transcription
(c) transition
(d)transversion
79. The number of linkage groups in Drosophila, Pisum, corn and mice are
(a) 4, 7,10 and 19 respectively
(b) 4, 7, 19 and 20 respectively
(c) 4, 7, 10 and 20 respectively
(d) 10,12,17 and 20 respectively
80. In a chromosome map, B and C give crossing over 3% and A and B 8%. What will be the percentage cross over between A and C?
81. ZZ/ZW type of sex determination is seen in
(a) Platypus
(b) snails
(c) cockroach
(d) peacock
82. Given below is a representation of a kind of chromosomal mutation. What is the kind of mutation represented?
Direction (Q. Nos. 83-87) In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as
(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) If Assertion is true, but Reason is false.
(d) If both Assertion and Reason are false.
83. Assertion The duplicate genes are also called pseudoalleles.
Reason Duplicate genes although present’ on different locus but have the ability to produce same or almost same trait of a character.
84. Assertion An organism with lethal mutation may not even develop beyond the zygote stage.
Reason All types of gene mutations are lethal.
85. Assertion In humans, female sex is detbrmihed by XX-chromosomes.
Reason Male sex is determined by XY-chromosomes.
86. Assertion In humans, the gamete contributed by the male determines whether the child produced will be male or female.
Reason Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y-chromosome.
87. Assertion The genetic complement of an organism is called genotype.
Reason Genotype is the sum of hereditary properties of an organism.
88.Match the following columns.
Codes
A B C D A B C D
(a) 2 14 5 (b) 4 1 5 2
(c) 5 4 1 2 (d) 3 2 4 5
89.Match the following columns.
Codes
A B C D A B C D
(a) 1 2 3 4 (b) 4 1 5 2
(c) 2 1 4 5 (d) 5 4 1 2
90.A gene showing codominance has
(a) one allele dominant on the other
(b) alleles tightly linked on the same chromosome
(c) alleles that are recessive to each other
(d) both alleles independently expressed in the heterozygote
91. The movement of a gene from another is called
(a) inversion
(b) duplication
(c) translocation
(d) crossing over
92. A human female with Turner’s syndrome
(a) has 45 chromosomes with XO
(b) has one additional X-chromosome
(c) exhibits male characters
(d) is able to produce children with normal husband
93. If two persons with ‘AB’ blood group marry and have sufficiently large number of children, these children could be classified as ‘A’ blood group: ‘AB’ blood group: ‘B’ blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals the presence of both ‘A’ and ‘B’ type proteins in ‘AB’ blood group individuals. This is an example of [NEET 2013]
(a) incomplete dominance
(b) partial dominance
(c) complete dominance
(d) codominance
94. Which of the following-statements is not true of two genes that show 50%> recombination frequency?
(a) The genes are tightly linked
(b) The genes show independent assortement
(c) If the genes are present on the same chromosome, they undergo more than one cross overs in every meiosis
(d) The genes may be on different chromosomes
95. If both parents are carries for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
(a) 50%
(b) 25%
(c) 100%
(d) no chance
96. The incorrect statement with regard to haemophilia is
(a) it is a recessive disease
(b) it is a dominant disease
(c) a single protein involved in the clotting of blood is affected
(d) it is a sex-linked disease .
97. Which Mendelian idea is depicted by a cross in which the Frgeneration resembles both the parents?
(a) Law of dominance
(b) Inheritance of one gene
(b) Co-dominance
(d) Incomplete dominance
98. F2-generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of
(a) codominance
(b) dihybrid cross
(c) monohybrid cross with complete dominance
(d) monohybrid cross with incomplete dominance
99. Which one of the following conditions correctly describes the manner of determining the sex in the given example?
(a) XO type of sex chromosomes determine male sex in grasshopper
(b) XO condition in humans as found in Turner’s syndrome, determines female sex
(c) Homozygous sex chromosomes (XX) produce male in Drosophila
(d) Homozygous sex chromosomes (ZZ) determine female sex in birds
100. The person with Turner’s syndrome has
(a) 45 autosomes and X- chromosome
(b) 44 autosomes and XYY- chromosomes
(c) 45 autosomes and XYY- chromosomes
(d) 44 autosomes and X- chromosome
101. Sickle-cell anaemia is example of
(a) sex-linked inheritance
(b) deficiency disease
(c) autosomal heritable disease
(d) infectious disease
102. Genotypic and phenotypic ratio 1:2 :1 in the offsprings explain the principle of
(a) dominance
(b) blending inheritance
(c) recessiveness
(d) All of the above
103. Which one of the following cannot be explained on the basis of Mendel’s law of dominance?
(a) The discrete unit controlling a particular character is called a factor
(b) Out of one pair of factors one is dominant and the other recessive
(c) Alleles do not show any blending and both the characters recover as such in F2-generation
(d) Factors occur in pairs
104. ABO blood group in humans are controlled by the gene I. It has three alleles, i.e. IA, lB and i. Since, there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
(a) Three
(b) One
(c) Four
(d) Two
Answers :
