Biology Chapter 13 Entry test MCQs
51. Genotype for AB’ blood group:
a. I^A I^B Dd
b. I^A I^B dd
c. I^AI^A dd
d. I^A I^B DD
Gene Linkage, Crossing Over and Recombination Frequency
52. Which of the following will not result in variations among siblings?
a. Crossing over
b. Independent assortment of genes
c. Mutation
d. Linkage
53. If all four phenotypic combinations are (parental and recombinants) are produced in equal ration 1:1:1:1 then there would be:
a. Complete linkage between genes
b. No linkage between genes
c. Tight linkage between genes
d. Partial linkage between genes
54. All of the following can form a linkage group on human chromosome 11 except:
a. Sickle cell anemia
b. Gout
c. Leukemia
d. Albinism
55. The recombination frequency is 20% between the two genes. The distance between them in unit map is:
a. 30
b. 20
c. 80
d. 60
56. Genes A, B, C, and D are located on the same chromosome. The recombination frequencies (RF) are as follows:
a. ACBD
b. BCAD
c. ABCD
d. CBAD
57. Number of pairs of autosomes in humans is:
a. 24
b. 23
c. 22
d. 21
58. There are———-linkage groups in human.
a. 23
b. 22
c. 80
d. 46
59. Chance of a cross over between two loci is directly proportional to their:
a. Distance
b. Length
c. Thickness
d. Width
60. A person was married to his cousin and both are heterozygous for sickle cell anemia. Among their four kids, what will be proportion of affected homozygotes?
a. 25%
b. 50%
c. 100%
d. 75%
61. In which situation, genes are not assorted independently during meiosis in a chromosome?
a. When some genes have mutated on the chromosome
b. When genes are not linked and their loci are far apart
c. When genes are linked and their loci are close to each other
d. When there are too many genes on a chromosome
62. Which situation can reduce the chances of variation and genetic recombination?
a. Gene linkage
b. Random fusion of gametes
c. Mutation
d. Crossing over
63. During crossing over, exchange of segments takes place between:
a. Non-sister chromatids of non-homologous chromosomes
b. Sister chromatids of homologous chromosomes
c. Sister chromatids of non-homologous chromosome
d. Non-sister chromatids of homologous chromosomes
Sex Linkage in Drosophila
64. Drosophila has four pairs of chromosomes. How many linkage groups does it have?
a. Four
b. Eight
c. One more than the pairs of chromosomes
d. One less than the pairs of chromosomes
65. Genes are present on chromosomes. This was experimentally proved by:
a. Morgan
b. Sutton
c. Landsteiner
d. Fleming
Sex Linkage in Humans (Hemophilia & Color Blindness)
66. Which of the following is not a genetic disorder?
a. Phenylketonuria
b. Hemophilia
c. Epilepsy
d. Colour blindness
67. Example of X-linked dominant trait is:
a. Hemophilia B
b. Hemophilia A
c. Hypophosphatemia
d. Tritanopia
68. All of the following are non-allelic X-linked traits except:
a. Hemophilia B
b. Hemophilia A
c. TFM syndrome
d. Hemophilia C
69. Which is not related to color blindness?
a. Rhodopsin
b. Zigzag pattern of inheritance
c. More common in men
d. Passes directly from father to son
70. Regarding color blindness when a normal male marries a carrier female, which is the correct statement?
a. All sons will be color blind
b. All daughters will be color blind
c. Half of the sons will be color blind
d. All daughters will be carriers
71. What is the probability of a hemophilic daughter of a normal man whose father was hemophilic and a carrier woman?
a. 25%
b. 0%
c. 75%
d. 50%
72. X-linked recessive trait is:
a. Vitamin-D resistant rickets
b. Hypophosphatemia
c. Diabetes mellitus
d. Haemophilia
73. Which one of the following is X-linked trait?
a. Diabetes mellitus
b. Male pattern baldness
c. Erythroblastosis foetalis
d. Haemophilia
74. The gene for red-green color blindness is present on:
a. X-chromosome
b. Y-chromosome
c. Autosome No.9
d. Autosome No. 7
75. If a carrier haemophilic female (XX) is married to a haemophilic male (XY). What will be the ratio of presence of haemophilia in the children?
a. Females and males both have 50% chances to getting haemophilia
b. 100% all females and males will be haemophiliac
c. Females have 50% chances of getting haemophilia and females will be 100% haemophilic
d. Carrier female 25% haernophilic female 25%, 25% normal male and 25% haemophilic male