Population genetics · USMLE Step 1

In Hardy-Weinberg equilibrium, which term represents the frequency of heterozygotes?

  1. p–q
  2. 2pq
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Correct answer: 2pq

Heterozygotes are represented by 2pq in the Hardy-Weinberg equation. Homozygous frequencies are p² and q². p–q does not appear in the equation.

Difficulty: Medium Question 18 of 20

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