A D=0.20; d = 0.80
Step-by-step explanation:
p² + 2pq + q² = 1
We find genetic frequency of the recessive gene then allelic frequency for the recessive alele;
q² = 32/50
q² = 0.64
q = 0.8
Allele frequencies of a gene add up to 1;
P + q = 1
p + 0.8 = 1
p = 1 – 0.8
p = 0.2