Question

A population of snails exhibits two morphotypes- (i) dominant dark color [DD an Dd], and (ii) recessive light color [dd].You observe in a population produces 25% homozygous dominant, 43% heterozygous, and 32% homozygous recessive. If there were 100 individuals in the population, how many dominant alleles are present in the entire population

Answer 1

To find the frequency of the dominant allele;
The following formula p + q = 1; p2 + 2pq + q = 1
DD (D2) = 25% = 0.25
D = ü0.25 = 0.5
The frequency of the dominant allele is therefore 0.5  or 50%. Therefore out of a population of 100 snails.
50/100*100 = 50
50 dominant allele are therefore present in the snail population.