Question

The Hardy-Wein-berg equation used to reflect genotypic frequencies in a population, is
$p^2+2pq+q^2=1$
The value of $p^2$ reflects

• A. The frequency of individuals in the population with the dominant phenotype
• B. The frequency of individuals in the population with the homozygous dominant genotype
• C. The frequency of the dominant allele in the population
• D. The frequency of individuals in the population with the homozygous recessive genotype
• E. The frequency of individuals in the population that are heterozygous

Answer 1

The correct option is B The frequency of individuals in the population with the homozygous dominant genotype

Hardy-Weinberg equation is $p^2$ + 2pq + $q^2$ = 1. Here p is the frequency of the "A" allele and q is the frequency of the "a" allele in the population. Thus, $p^2$ represents the frequency of the homozygous dominant genotype AA, $q^2$ is the frequency of the homozygous recessive genotype aa, and 2pq represents the frequency of the heterozygous genotype Aa. Further, it also states that the sum of the allele frequencies for all the alleles at the locus should be 1, so p + q = 1. Thus, the correct answer is option B.