In a Hardy – Weinberg population, the recessive genotype frequency is 0.04. Estimate the heterozygous genotype frequency in that population.

Recessive genotype frequency

 $\left(q^2\right)=0.04$

 Recessive allele frequency

$\left(q\right)=\sqrt{0.04}=0.2$

Dominant allele frequency (p)

= 1 – 0.2 = 0.8

Heterozygous genotype frequency (2pq)

$=2\left(0.8\times 0.2\right)=0.32$