Question

In a certain population, the frequency of three genotypes is as follows:
Genotypes: PP Pp  pp 
Frequency: 22%  62%  16% 
Choose the option that shows the frequency of P and p alleles correctly:

• A. 53% and 47%
• B. 47% and 53%
• C. 40% and 46%
• D. 22% and 16%

Hint:

To calculate allele frequency from genotype frequency, use: Allele frequency = (2 × Homozygous + 1 × Heterozygous) ÷ (2 × Total individuals).

Answer 1

The Correct Option is A

Let frequency of P = p_P and p = p_p.
Given:
PP = 22% → Homozygous dominant = 22% contributes 100% P allele = 0.22
Pp = 62% → Heterozygous = contributes 50% P and 50% p = 0.31 P + 0.31 p
pp = 16% → Homozygous recessive = 16% contributes 100% p = 0.16
So, frequency of P = 0.22 + 0.31 = 0.53 or 53%
Frequency of p = 0.31 + 0.16 = 0.47 or 47%