What is the primary difference between a population bottleneck and the Founder Effect?
Answer
A bottleneck is a severe reduction from an existing large population, whereas the Founder Effect occurs at the moment a new colony is established by a small sample.
Both involve strong drift due to small size. A bottleneck is caused by a sudden disaster reducing an existing population, while the Founder Effect describes the drift that happens immediately when a small group establishes a completely new, isolated colony.
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