Allopatric speciation begins when
Answer and explanation
Correct answer: B. a population is divided by a geographical barrier
- Step 1: Gene flow stops between the separated groups, so they diverge over time.
Answer
a population is divided by a geographical barrier.
Why not the others: two species hybridise successfully: hybridisation tends to blur the differences between species. a mutation occurs in the gametes of every individual: speciation needs isolation of populations, not a single mutation. a population lives in a single habitat for a long time: no barrier exists in this situation.
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