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Morphological and Anatomical Evidences

Variation in ...

Question

Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred 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 rather than by natural selection is referred to as Genetic drift. This phenomenon is also called Sewall Wright effect.

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

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

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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