Which of the following selection type shifts the mean of a continuous phenotype such as size or length?

Artificial selection

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Directional selection

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Disruptive selection

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Neutral selection

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Stabilizing selection

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Solution

The correct option is B Directional selection
Directional selection tends to shift the distribution curve in one direction thereby changing the average value of the character. This is because directional selection favors phenotypes at one of the extremes in a normal distribution and over successive generations, one phenotype will gradually replace the other.

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IV)Random changes in gene frequencies due to chance in large population is called genetic drift.
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