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Gene Pool

Variation in ...

Question

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

A

Genetic load

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B

Genetic flow

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C

Genetic drift

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D

Random mating

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Solution

The correct option is C Genetic drift
When the frequency of some genes gets changed in a small population due to some accidental reasons, such phenomenon is known as Genetic Drift.
It gives rise to different changes in sub-populations. It is random and rarely produces adaptations to the environment.
So, the correct answer is 'Genetic drift'

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Similar questions

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

Q. Which of the following factors can change allelic frequency?
A. Gene flow
B. Natural selection
C. Random mating
D. Founder effect
E. Genetic recombination

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.
True statements are

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. Assertion: Hardy-Weinberg principle states that in the absence of disturbing influences, gene frequencies of large populations of sexually reproducing organisms do not change, provided that matings, occur at random.

Reason: The disturbing influences include mutation, gene flow, genetic drift, genetic recombination and natural selection.

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