The few ancestors of the Galapagos finches who colonized the islands would be an example of:

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The few ancestors of the Galapagos finches who colonized the islands is an example of the founder effect, which occurs when a small group of individuals leaves a larger population and establishes a new one, leading to a loss of genetic variation. This can result in the new population having a different genetic makeup than the original population if certain alleles become overrepresented or lost entirely.

The Few Ancestors of the Galapagos Finches Who Colonized the Islands