An ecosystem undergoes a sudden drastic change that now favors organisms with an extreme phenotype. Which one of the following is true for such an ecosystem?

Genetic drift

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Founder effect

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Artificial selection

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Disruptive selection

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Directional selection

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Solution

The correct option is E Directional selection
Since one of the extreme phenotypes is being favored, the population would shift towards one of the extremes. Selection, when one of the extreme phenotypes is being favored, is termed as directional selection. In disruptive selection, both extremes are favored.
Therefore, the correct answer is option E.

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