Multiple choice

Which of the following statements is CORRECT regarding genetic bottlenecks?

  1. They take place when there are severe environmental changes that alter natural selection so that most members of a species die before reproducing.

  2. The result is typically increased genetic diversity in a population following a genetic bottleneck.

  3. They minimze the fertility of the survivors.

  4. They does not affect genetic diversity in a population.
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A Correct answer
Explanation

The result of such catastrophes is a dramatic reduction in genetic diversity of future generations. The variability is lost at the time of the bottleneck as a result of most individuals dying without reproducing.

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