Imagine That Two Men and Two Women Settle on an Uninhabited

question 83

Multiple Choice

Imagine that two men and two women settle on an uninhabited island, no new settlers arrive, and nobody leaves the island for many generations. All four of the settlers have brown eyes, but one of the men carries a recessive gene for blue eyes. Eye color has no effect on fitness. If the percentage of blue-eyed individuals on the island increases from 0% to 25%, what is the probable cause?

• A)artificial selection
• B)natural selection
• C)random mutation
• D)genetic drift

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Definitions:

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