Population genetics · USMLE Step 1

Which event increases homozygosity within a population?

  1. Gene flow
  2. Inbreeding
  3. Mutation
  4. Directional selection
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Correct answer: Inbreeding

Inbreeding promotes homozygosity by increasing the chance of inheriting identical alleles. Mutation introduces new alleles, increasing variation. Gene flow mixes populations.

Difficulty: Medium Question 17 of 20

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