Population genetics · USMLE Step 1

Migration of individuals between populations results in which genetic effect?

  1. Genetic drift
  2. Gene flow
  3. Founder effect
  4. Fixation of alleles
Show answer and explanation

Correct answer: Gene flow

Gene flow refers to the exchange of alleles between populations, reducing genetic differences. It counteracts drift. The founder effect involves isolation, not migration into a population.

Difficulty: Medium Question 9 of 20

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