Evolution and speciation · USMLE Step 1

Which scenario best illustrates peripatric speciation?

  1. A large population divided by a rising mountain range
  2. A small group colonizing a remote island and diverging from the mainland
  3. Continuous populations diverging gradually across an environmental gradient
  4. Two populations in the same area evolving separately without interbreeding
Show answer and explanation

Correct answer: A small group colonizing a remote island and diverging from the mainland

Peripatric speciation involves a small, peripheral population becoming isolated (such as on an island), leading to rapid genetic divergence from the mainland population — a special case of allopatric speciation.

Difficulty: Medium Question 8 of 20

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