In a large population of humans,4% of individuals exhibit the recessive phenotype.What percent of individuals are homozygous for the dominant phenotype?

Question

Quizplus · Accepted Answer

Let's use p and q to represent the frequencies of the dominant and recessive alleles, respectively. Since q² = 0.04 (the frequency of recessive phenotype), then q = 0.2.

Since p + q = 1 and q = 0.2, then p = 0.8.

Homozygous dominant individuals have the genotype PP, which means they only carry the dominant allele. The frequency of homozygous dominant individuals in the population can be calculated by squaring the frequency of the dominant allele:

p² = (0.8)² = 0.64, or 64%.

Therefore, the correct answer is D.

In a Large Population of Humans,4% of Individuals Exhibit the Recessive