p2 + 2pq + q2 = 1
p = frequency allele ("A") at a locus (def. 4) in the population
q = frequency allele ("a") at a locus in the population
p2 = frequency of homozygote A genotype in a population (that is, frequency of p squared, p X p, because you have two copies, AA, at a locus)
q2 = frequency of homozygote a genotype in a population
2pq = frequency of heterozygote genotype in a population
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