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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.

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

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

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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