AP BIOLOGY

Detailed explanation-1: -64% of the population has the recessive phenotype. What is the percentage of the recessive genotype? A population’s recessive allele frequency 25%.

Detailed explanation-2: -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-3: -A monohybrid cross is a cross between two individuals with different alleles at one genetic locus. If we cross two heterozygous individuals (Aa), then the percentage of offsprings with recessive phenotype will be: Aa x Aa = AA Aa Aa aa, so recessive phenotypes would be 1/4 = 25%.

Detailed explanation-4: -60% of alleles of a gene in a population are recessive.

Detailed explanation-5: -In a certain population which is in Hardy-Weinberg equilibrium, there are only two eye colours: brown (dominant) and blue (recessive). 16 % have blue eyes in the population.