Population Genetics and Genetic Disorders - Genetics - Life Sciences Previous Year Questions

1

2012 · Life Sciences · Genetics · Population Genetics and Genetic Disorders

Life Sciences (XL) 2012

Red-Green color blindness is an X-linked recessive disorder. In a population which is in the Hardy-Weinberg equilibrium, the incidence of occurrence of this in males is 1:1000. What will be the expected incidence of affected homozygous females?

A

1 in 1002000

B

1 in 2000000

C

1 in 1001000

D

1 in 1000000

Open complete paper

2

2016 · Life Sciences · Genetics · Population Genetics and Genetic Disorders

Life Sciences (XL) 2016

Hardy Weinberg's equilibrium for a locus with two alleles p and q is mathematically defined as p2 + q2 + 2pq = 1. Which of the following equations represents the corresponding equilibrium for a locus with three alleles p, q and r? (P, Q and R represent the frequencies of p, q and r, respectively)

A

P³ + Q³ + R³ + 3PQR = 1

B

P² + Q² + R² + 2PQ + 2QR + 2PR = 1

C

P²Q + Q²R + R²P + 2PQ + 2QR + 2PR = 1

D

P² + Q² + R² + 2P²Q + 2Q²R + 2P²R = 1

Open complete paper

3

2017 · Life Sciences · Genetics · Population Genetics and Genetic Disorders

Life Sciences (XL) 2017

In a population which is in Hardy-Weinberg equilibrium, the frequency of the recessive genotype of a certain trait is 0.09. The percentage of individuals with heterozygous genotype is ___%

Check answer

Open complete paper

4

2018 · Life Sciences · Genetics · Population Genetics and Genetic Disorders

Life Sciences (XL) 2018

In a population which is in Hardy-Weinberg equilibrium, the frequency of occurrence of a disorder caused by recessive allele (q) is 1 in 1100. The frequency of heterozygotes in the population will be __________. (Give the answer to three decimal places).

Check answer

Open complete paper

5

2019 · Life Sciences · Genetics · Population Genetics and Genetic Disorders

Life Sciences (XL) 2019

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).

Check answer

Open complete paper

6

2021 · Life Sciences · Genetics · Population Genetics and Genetic Disorders

Life Sciences (XL) 2021

In a population of a diploid plant species obeying Hardy-Weinberg equilibrium, a locus regulating flower color has two alleles R and r. Individuals with RR, Rr and rr genotypes produce red, pink and white flowers, respectively. If the ratio of red, pink and white flower-producing individuals in the population is 6:3:1, then the frequency of r allele in the population would be __________%. (Round-off to two decimal places.)

Check answer

Open complete paper

7

2021 · Life Sciences · Genetics · Population Genetics and Genetic Disorders

Life Sciences (XL) 2021

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).

Check answer

Open complete paper

8

2026 · Life Sciences · Genetics · Population Genetics and Genetic Disorders

Life Sciences (XL) 2026

Below are the numbers of individuals of migratory green warblers and the frequencies of three genotypes at a single locus for this species. F refers to the allele for faster migration and S to the allele for slower migration.

	FF	FS	SS	Total
Number of individuals	35	20	10	65
Genotype frequencies	0.54	0.30	0.16	1

What are the allele frequencies of F and S? (round off to 2 decimal places)

A

Allele frequency of F = 0.69 and allele frequency of S = 0.31

B

Allele frequency of F = 0.59 and allele frequency of S = 0.41

C

Allele frequency of F = 0.31 and allele frequency of S = 0.69

D

Allele frequency of F = 0.50 and allele frequency of S = 0.50

Open complete paper