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Mutation

Variation in ...

Question

Variation in gene frequencies within populations can occur by chance rather than by natural selection. The is referred to as :-

A

Random mating

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B

Genetic drift

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C

Genetic flow

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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.

Genetic drift is an important mechanism in evolutionary change in small population. Random change in the frequencies of alleles occur from generation to generation due to chance events.

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Q. Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as

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Q. Read the following statements
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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Q. Assertion :Genetic drift refers to change in allelic frequencies of a gene pool due to chance and occurs both in large and small populations. Reason: Small populations will, therefore, suffer more than larger ones.

Q. Change in gene frequency which occurs by chance in a small population is called___________.

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