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1. Which of the following best expresses the concept of the word “allele”?
A) Genes for wrinkled & yellow C) Genes for wrinkled & round
B) Phenotypes D) Mutations
2. Which of these traits zigzags from maternal grandfather through a carrier daughter to a grandson?
A) Autosomal B) X-linked C) Y-linked D) X&Y linked
3. _____________of haemophiliacs suffer from Haemophilia A:
A) Less than 1% B) About 20% C) 80% D) 10%
4. Haemophilia B is due to abnormality of factors:
A) VIII B) IX C)XI D) IV
5. Each type of cone cell in the retina has specific light-absorbing protein cells:
A) Albumin B) Opsin C) Haemoglobin D)Auxin
6. Gene for blue opsin is present on chromosome number:
A)7 B)9 C)11 D)19
7. Red colour blindness is called:
A) Protanopia B) Deuteranopia C) Tritanopia D) Protanomalous
8. The risk of a colour blind child is _______ when the father is colour blind while the mother is normal:
A)0% B)25% C)50% D)100%
9. Which of the following is an example of an x-linked recessive trait in humans?
A)Hypophosphatemic rickets C)Baldness
B)Colour blindness D)Beard growth
10. Which of the following will be Colour blind?
A)XCXC B)XCXc C)XCY D)Xcy
11. Of both normal parents, the chance of a male child becoming colour blind is
A)No B)Possible only when all the four grandparents had normal vision
C)Possible only when the father’s mother was colour blind
D)Possible only when the mother’s father was colour blind
12. Which trait in humans is an example of a multiple alleles?
A) Skin color B) Rh-blood group C) Eye color D) A B O-blood group
13. Position of an allele within a DNA Molecule is
A) Origin B) Locus C) Epistasis D) Pleiotropy
14. it is an example of codominance
A) Blood group A B) Blood group B C) Blood group AB D) Blood group O
15. Tritanopia is blindness of
A) Red colour B) Green colour C) Blue colour D) Pink colour
16. How many linkage groups will be present in the case of human beings?
A) 23 B) 44 C) 46 D) 24
17. Skin color in humans, caused by several genes at several loci, is an example of
A) Continuously varying trait C) Incomplete dominance.
B) Polygenic inheritance. D) Both A & B
18. In sex-linked color blindness, the more commonly found are ________.
A) Color-blind females C) Color-blind males
B) Both are about equal D) Color blindness is unrelated to sex linkage.
19. An individual with blood type A marries an individual with blood type B. What blood types could their
offspring exhibit?
A) AB B) O C) B D) All of these are possible
20. _________ is a dihybrid
A) RRYy B) rrYy C) RrYy D) Rryy
21. The principle of independent assortment is not true for
A) Incomplete dominance C) Homozygotes
B) Heterozygotes D) Linked genes
22. A carrier woman will have a hemophiliac son when married to a:
A) Normal man C) Affected man
B) Either normal or hemophiliac man D) Carrier man
23. What is the risk of a color-blind child in a family when the father is color blind but the mother is the carrier?
A) Zero % B) 50% C) 25% D) 100%
24. Choose the best statement that explains Mendel’s law of segregation:
A) Dominant and recessive traits are transmitted independently from one generation to the next so that
neither trait has any influence on the inheritance of the other
B) Inheritance of one gene is not influenced by the inheritance of another and genes assort
independently in successive generations
C) One allele of a gene is dominant over the other
D) One gene masks the effect of the other and is not transmitted independently from one generation to
another
25. Alleles of a gene are found on
A) Same chromosome C) Nonhomologous chromosomes
B) Homologous chromosomes D) Any chromosomes
26. Ratio 9 : 3 : 3: 1 is due to
A) Duplicate genes C) Lethal genes
B) Monohybrid cross D) Dihybrid cross
27. Multiple alleles are characterized by
A) More than two alternate forms of a gene found at the same locus
B) More than two alternate forms of a gene found at different loci
C) Occurrence of one gene in two chromosomes
D) None of the above.
28. Crossing-over causes:
A) Expression of recessive genes C) Synapsis between homologous chromosomes
B) Recombination between linked genes D) Linkage between dominant genes.
29. Telomere repetitive DNA sequences control the function of eukaryotic chromosomes because they:
A) Act as replicons C) Are RNA transcription initiator
B) Help chromosome pairing D) Prevent chromosome loss
30. ________ is the proportion of recombinant types between two gene pairs as compared to the sum of all combinations
A) Gene Frequency C ) Recombination frequency
B) Allele frequency D) Recombinant types
31. Two parents, both of blood group A, have daughters of blood group O.
What is the probability that their next child will be a boy who has blood group O?
A. 0.125 B. 0.50 C. 0.375 D. 0.75
32. The four children of two parents each have a different blood group of the ABO series. What were the
blood groups of the parents?
A) A and AB B) A and B C) A and O D) B and Ab
33. Blood group A can be transfused only into:
A) O recipients B) A recipients C) A & AB recipients D) AB recipients
34. All of the following are continuously varying traits except:
A) Kernel colour in wheat C) Height in humans
B) Skin colour in humans D) Tongue rolling in humans
35. How many possible alleles of the ABO blood group are present in an individual?
A) 1 B) 2 C) 3 D) 300
36. Which one is true for crossing over?
A) Non-sister chromatids of the homologous chromosome, meiosis
B) Non-sister chromatids of the homologous chromosome, mitosis
C) Sister chromatids of the homologous chromosome, meiosis
D) Sister chromatids of the homologous chromosome, mitosis
37. A reversal in the order of a segment of a chromosome:
A) Base substitution C) Deletion
B) Insertion D) Inversion
38. A pure breeding tall plant was crossed to a dwarf plant. What would be the probability of the “Tt” genotype in F2
A) 0.25 B) 0.50 C) 0.75 D) None of these
39. The gene D which controls Rh blood groups has how many alleles
A) one B) two C) three D) four
40. F2 wrinkled when self-fertilized produced
A) Round and wrinkled seeds C) Only round seeds
B) Only wrinkled seeds D) Seeds in between the round and wrinkled
41. A linkage group is composed of genes which
A) associate during prophase I C) segregate at mitosis
B) are in the different chromosomes D) are situated on the same chromosome
42. Feature correct to O-negative blood group:
A) A & B antigen present C) Rh antigen present
B) Anti-A & anti-B antibodies present D) Rh antibody present
43. In a dihybrid cross, out of 16 plants obtained, the number of different genotypes will be:
A) 4 B) 9 C) 16 D) 12
44. Blood group B phenotype contains anti-A antibodies in the serum and agglutinates any RBC with
antigen:
A) A B) B C) O D) None of these
45. What would be a phenotype of a person with genotype IAI
B, Dd?
A) O -ve B) AB -ve C) AB +ve D) O +ve
46. Genotype of a light pink colored wheat grain will be:
A) AaBBCC B) aaBbcc C) AABbcc D) AAbbcc
47. When an individual is having both the alleles of contrasting charters it is said to be
A) Heterozygous B) Dioeious C) Monoecious D) Hermaphordite
48. The gene with multiple alleles is called:
A) Polygenic gene C) Pleiotropic gene
B) Epistatic gene D) Polymorphic gene
49. The genetic complement of a trait is called:
A) Genotype B) Phenotype C) Karyotype D) Genome
50. Which is not true about the linked genes?
A) They reduce the chance of variation
B) They are physically linked
C) They may show an independent assortment
D) Linkage groups correspond to the number of homologous pairs
51. Which of the following is a discontinuous trait:?
A) Human height C) Human eye color
B) Human skin color D) ABO blood group
52. Genes showing linkage are always on:
A) the Same chromosome of different genomes C) the Same chromosome of the same genome
B) Different chromosomes of the same genome D) Different chromosomes of different genomes
53. What type of gametes will be formed by genotype RrYy?
A) RY, Ry, rY, ry C) RY, Ry, ry, ry
B) Ry, Ry, Yy, ry D) Rr, RR, Yy, YY
54. In Mendelian dihybrid cross, how many progenies in F2 generation possess genotype rryy?
A)16/1
B)/162
C)/163
D)/164
55. A pea plant with yellow seeds was crossed with a plant having green seeds. What will happen in F1; if plants are true breeding?
A) All seeds will be yellow C) Half of the seeds will be yellow
B) All the seeds will be green D) Both will be present in a ratio of 1:2:1
56. When a tall and red-flowered individual is crossed with a dwarf and white-flowered individual,
the phenotype in the progeny is dwarf and white. What will be the genotype of tall and red-flowered individuals?
A) TtRr B) TTRr C) TTRR D) TtRR
57. Pure Line breed refers to:
A) Heterozygosity only C) Heterogosity and linkage
B) Homozygosity only D) Homozygosity
58. Which of the following terms represents a pair of contrasting characters?
A) Homozygous B) Heterozygous C) Allele D) Phenotypes
59. A cross used to ascertain whether a dominant is homozygous or heterozygous is termed:
A) Monohybrid C) Reciprocal
B) Back cross D) Linkage cross
60. When a red-flowered plant was crossed with a white-flowered plant, the F1 generation consisted of a majority of red-flowered plants. Genes for red color were:
A) Recessive C) Dominant
B) Sex-linked D) assorted
61. Monohybrid cross is a cross between:
A) Two individuals differing in two traits C) F1 individual with a parents
B) Two individuals of two different parents D) Two individuals differing in one trait
62. How many pairs of homologous chromosomes are present in Pisum sativum
A) five pairs B) six pairs C) seven pairs D) eight pairs
63. Which of the following characteristics of the pea plant is dominant
A) Axial flowers B) Terminal flower C) White flowers D) None of these
64. Filial is a Latin word. It means
A) spring B) issue C) progeny D) descendent
65. The gene which controls the ABO group has how many alleles
A) one B) two C) three D) four
66. The gene which does not follow the law of independent assortment
A) crossed genes B) linked genes C) recessive genes D) none
67. During test cross, if all offsprings are phenotypically dominant then parents are
A) homozygous C) heterozygous
B) one homozygous other heterozygous D) none of these
68. Which of the following blood group is always Homozygous
A) A B) B C) AB D) O
69. All the genes/alleles found in a breeding population at a given time are collectively called
A) Gene pool B) Gene frequency C) Genotype D) Genetic drift
70. F2 generation of a monohybrid cross yields the offspring in the genotypic ratio of
A) 3:1 B) 1:1 C) 1:2:1 D) 1:3:1
71. The gametes of parents having the genotype RrAA should be as
A) RA, Ra B) ra , ra C) RA, rA D) Ra, rA
72. No antigen is found in the blood of a person having the blood group
A) A B) B C) AB D) O
73. Which one of the following phenotypic features of Man can be affected only by the genotype?
A) height C) Intelligence
B) skin color D) number of different blood group antigens
74. 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
B) Will be partially colour blind since he is heterozygous for the colour blind mutant allele
C) Must be colour blind
D) May be colour blind or may be of normal vision
75. In seven pairs of contrasting characters in the pea plant studied by Mendel the number of flowers based
characters were:
A) 1 B) 2 C) 3 D) 4
76. A condition, where a certain gene is present in only a single copy in a diploid cell is called:
A) Heterozygous B) Monogamous C) Homozygous D) Hemizygous
77. Which methodology of Mendel was different and was the main reason for his success:
A) He studied the inheritance of single traits at a time
B) He studied the inheritance of several traits together
C) He collected all data carefully
D) He was capable of analyzing collected data mathematically
78. An allele is said to be dominant if:
A) It is expressed in both homozygous and heterozygous conditions
B) It is expressed only in the second generation
C) It is expressed only in heterozygous
D) It is expressed only in homozygous condition
79. Heterozygous tall plant is crossed with a homozygous dwarf plant then the percentage of progeny having dwarf characters is:
A) 0% B) 50% C) 25% D) 100%
80. If a cross between two individuals produces offspring with 50% recessive characters (a), then the genotypes of parents are:
A) Aa X Aa B) AA X aa C) Aa X aa D) AA X Aa