Question

1. In a certain population, the frequency of three genotypes is as follows:

Genotypes: BB Bb bb

frequency: 22% 62% 16%

What is the likely frequency of B and b alleles?

Answer 1

According to hardy weinberg principle p²+2pq+q²

Thus, BB= p², bb= q²

Frequency of B = All of BB + ½ of Bb = 22 +31 = 53%
Frequency of b = All of bb + ½ of Bb = 16 + 31 = 47%

Hardy Weinberg equilibrium is represented by

P ² + q ² + 2Pq = 1

Where, P ² is the frequency of AA genotype individuals, q ² is the frequency of aa genotype individuals Pq is the frequency of Aa genotype individuals.

Here, in this case, p² = BB, q² = bb, pq= Bb.

Therefore, frequency of B is likely to be 53% and that of b is likely to be 47%