A small group of birds colonises an island, and the group has a higher frequency of one allele than the original population. This is an example of:
Answer and explanation
Correct answer: B. The founder effect
- Step 1: A new population started by a few individuals carries only part of the original gene pool.
- Step 2: Chance sampling of alleles in the founders is the founder effect, a type of genetic drift.
Answer
the founder effect.
Why not the others: A bottleneck follows a reduction of an existing population; gene flow needs contact between populations; humans were not involved.
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