AP BIOLOGY

Detailed explanation-1: -The recessive phenotype is controlled by the homozygous aa genotype. Therefore, the frequency of the dominant phenotype equals the sum of the frequencies of AA and Aa, and the recessive phenotype is simply the frequency of aa.

Detailed explanation-2: -Frequency of recessive allele is 0.2.

Detailed explanation-3: -To compare different phenotype frequencies, the relative phenotype frequency for each phenotype can be calculated by counting the number of times a particular phenotype appears in a population and dividing it by the total number of individuals in the population.

Detailed explanation-4: -In a population of 400 individuals, the frequency of a recessive allele is 40.