Population genetics · USMLE Step 1

Which factor most strongly disrupts Hardy-Weinberg equilibrium by introducing new alleles?

  1. Migration
  2. Random mating
  3. Large population size
  4. No natural selection
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Correct answer: Migration

Migration (gene flow) introduces new alleles into a population. Random mating and large population size support equilibrium. Absence of selection also maintains equilibrium.

Difficulty: Medium Question 19 of 20

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