When no other force, such as natural selection, is operating, genotypic frequencies reach the Hardy-Weinberg equilibrium. The proportions for alleles A and a will be A) freq(aa) = q² freq(Aa) = 2pq freq(AA) = p² B) freq(aa) = q freq(Aa) = 2pq freq(AA) = p C) freq(aa) = q²freq(Aa) = 2p²q freq(AA) = p² D) freq(aa) = q² freq(Aa) = 2p²q² freq(AA) = p²

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Quizplus · Accepted Answer

The Hardy-Weinberg equilibrium equation is p² + 2pq + q² = 1, where p is the frequency of the dominant allele (A) and q is the frequency of the recessive allele (a). In equilibrium, the genotypic frequencies will be p² for AA, 2pq for Aa, and q² for aa. Therefore, the proportions for alleles A and a will be p and q, respectively. Choice B correctly shows this with freq(AA) = p², freq(Aa) = 2pq, and freq(aa) = q².

When No Other Force, Such as Natural Selection, Is Operating