AP BIOLOGY

Detailed explanation-1: -Hardy Weinberg equation says, p2+2pq+q2=1, where q2 is the frequency of homozygous recessive gene.

Detailed explanation-2: -We know that the frequency of the recessive homozygote genotype is q2 and equal to 0.09.

Detailed explanation-3: -In the equation, p2 represents the frequency of the homozygous genotype AA, q2 represents the frequency of the homozygous genotype aa, and 2pq represents the frequency of the heterozygous genotype Aa.

Detailed explanation-4: -The Hardy-Weinberg Equation q = the frequency of the recessive allele in a population. 2pq = the frequency of the heterozygous dominant genotype. p2 = the frequency of homozygous dominant genotype. q2 = the frequency of homozygous recessive genotype.