Question

Brown hair(B) is dominant to blonde hair (b). If blonds occur in 36% of the population, what is the predicted frequency of homozygous dominant

• A. 36%
• B. 60%
• C. 40%
• D. 16%

Answer 1

The correct option is D

16%

According to Hardy – Weinberg equation
$p^2+2pq+q^2=1andp+q=1where{q}^2\left(homozygousrecessive\right)$=0.36(36%)
$\therefore q=\sqrt{0.36}=0.6\therefore p=1-0.6=0.4or{p}^2=0.16$
Homozygous dominant $\left(p^2\right)=0.16\times 100$%=16%
Heterozygotes are represented by 2pq= $2\times 0.4\times 0.6=0.48$(48%)