GATE XL topic:genetics PYQs & Answers — Page 2

Questions 11–20 of 26. Imported answers require independent review unless marked reviewed.

The average body length of Drosophila nasuta collected from Andaman and Nicobar Islands is 2 mm. From this population, a few males and females having a body length of 3 mm were selected and interbred. The average body length of the resultant progeny was 2.5 mm. The heritability (h²) of the body length in this population is _______. (round off to one decimal place)

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The two homologous genes occurring in different species are called

Your answerChoose one option.

paralogs

orthologs

pseudoges

prologs

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The expression of holandric genes causes which of the following genetic trait in humans?

Your answerChoose one option.

Haemophilia

Sickle cell anaemia

Down’s Syndrome

Hypertrichosis

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A man, whose mother and father had blood groups A and O respectively, marries a woman with blood group AB. If the man has blood group A, then the number of different blood groups possible among their children will be ________ (in integer).

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A population of snakes in an isolated island is in Hardy-Weinberg equilibrium for a gene with only two alleles (A and a). If the allelic frequency of A is 0.6, then the genetic frequency of Aa is ________ (round off to 2 decimal places).

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A cross is made between two animals of genotypes AaBb × AaBb, where loci A and B assort independently. The progeny of this dihybrid cross was then allowed to self-cross. The proportion of the progeny that showed segregation for loci A (i.e., produce A- and aa progeny) in % will be ________ (in integer).

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Match the following genetic disorders in Column I with associated typical chromosomal changes mentioned in Column II

Column I P. Klinefelter syndrome Q. Down syndrome R. Turner syndrome S. Cri du chat syndrome

Column II (i) 45,XO (ii) 5p minus (iii) 47,XXY (iv) Trisomy 21

Your answerChoose one option.

P-(iv), Q-(ii), R-(ii), S-(i)

P-(iv), Q-(ii), R-(i), S-(ii)

P-(ii), Q-(iv), R-(ii), S-(i)

P-(iii), Q-(iv), R-(i), S-(ii)

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In Drosophila, the red eye phenotype (W) is dominant over the recessive white eye mutant (w). In a mixed population of red and white eye flies of 10,000 individuals, 3,600 flies were white eyed. The percentage of the heterozygous red eye flies in this population is _____________.

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A distinctly large population of randomly mating laboratory mice contains 36% albino mice, which is caused by a double recessive genotype (aa). The black coloured mice in the population is due to dominant genotype (AA/Aa). Considering the fact that this population is in Hardy-Weinberg equilibrium, the frequency of heterozygous alleles (Aa) in this population is _____ (round off to 2 decimal places).

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A genetic cross was made between homozygous wild-type males (a⁺b⁺c⁺) and triple-mutant females (abc) of Drosophila melanogaster. Then the F₁ males (a⁺b⁺c⁺) were back crossed to the triple-mutant females which resulted in the following F₂ progenies:

Progeny	Number
a⁺bc	16
ab⁺c	115
abc	311
a⁺b⁺c	64
ab⁺c⁺	61
a⁺b⁺c⁺	317
a⁺bc⁺	99
ab c⁺	17
Total	1000

The order of genes as determined from the above data was found to be “b a c” (note that the order is equivalent to “c a b” and the order of outside markers are arbitrary).

The map distance between “b and c” is _____ centiMorgan (round off to 1 decimal place).

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GATE XL topic:genetics PYQs

Question 103

Question 2

Question 3

Question 8

Question 9

Question 20

Question 13

Question 20

Question 19

Question 20