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Morphological and Anatomical Evidences

Variation in ...

Question

Variation in gene frequencies within population can occur by chance rather than by natural selection. This is reffered to as

A

Genetic flow.

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B

Genetic drift.

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C

Random mating.

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D

Genetic load.

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Solution

The correct option is B Genetic drift.
Variation in gene frequencies within populations can occur by chance and is called as genetic drift.

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I) Directional selection occurs when natural selection favours one extreme of continuous variation.
II)Disruptive selection occurs when natural selection favours both extremes of continuous variation.
III) In directional selection, a population's genetic variance shifts toward a new phenotype when exposed to environmental changes.
IV)Random changes in gene frequencies due to chance in large population is called genetic drift.
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