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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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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: 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.

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

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