Question

13. The D gene in pea controls plant height. DD and Dd plants are tall and dd plants are short. In a particular population of pea plants, 64% of the individuals are tall, and the population is at Hardy- Weinberg equilibrium. Suppose that a change in climate imposes a selection coefficient (s) of 0.25 on the tall plants. After one generation in this new environment, what is the estimated frequency of the D allele?

A. 0.4
B. 0.192

C. 0.378

D. 0.277

E. 0.357

Answer 1

Answer :) Option (C) 0.378

If the population is at Hardy- Weinberg equilibrium, then the allele frequencies of both dominant and recessive alleles are 0.5.

The allele D and d are having 0.5 frequencies and the selection coefficient for the allele D is 0.25. it means 25% of offspring having D allele died in a generation.

We can calculate the next generation allele frequency by using below mentioned formula-

Allele frequency a’ = a x (1-s)

Here a is allele frequency of 1^st generation and a’ is the allele frequency of the next generation.

Allele frequency of allele D’ = 0.5 x (1-0.25)

Allele frequency of allele D’ = 0.375

This is closer to the 3^rd option (C) 0.378. therefore, the correct answer is option C.

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