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Gene Pool

Genetic Drift...

Question

Genetic Drift describes.

A

The change in frequency of a gene mearly by chance in small population

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B

The change in frequency of a gene that occurs mearly by selection

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C

The change in frequency of a gene that occurs mearly by selection and chance

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D

The change in frequency of a gene that does not influence in any extent

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Solution

The correct option is A The change in frequency of a gene mearly by chance in small population
Genetic drift is a mechanism of evolution in which there is a variation in the relative frequency of different genotypes in a small population over generations due to chance. Chance indicates the disappearance of particular genes as individuals die or do not reproduce. Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations.
So, the answer is A.

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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.

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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.
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