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Evolution

Change in gen...

Question

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

A

Gene migration

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B

Genetic drift

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C

Natural selection

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D

Gene recombination

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Solution

The correct option is B Genetic drift
Genetic drift is defined as the change in gene frequency that occurs by chance in a small population. It provides diversity to a population without any adaptations.

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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. Any changes in gene frequency in a population is called as

Q. Fill up the blanks in the following paragraph by selecting the correct option.
When migration of a section of population to another place and population occurs, __(i)__ change in the original as well as in the new population. New genes/ alleles are added to the __(ii)__ population and these are lost from the __(iii)__ population. There would be a __(iv)__ if this gene migration, happens multiple times. If the same occurs by chance, it is called __(v)__, Sometimes the change in allele frequency is so different in the new sample of population that they become a different species. The original drifted population becomes founders and the effect is called __(vi)__.

Q. The gene frequency of a population changes ____.

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

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