Gujarati
Hindi
6.Evolution
medium

Random unidirectional change in allele frequencies that occurs by chance in all populations and especially in small populations is known as

A

migration

B

natural selection

C

genetic drift

D

mutation.

(NEET-2013)

Solution

(c) : Genetic drift (Sewall Wright effect) is the random change in the frequency of alleles in a population over successive generations in the gametes. Each new generation differs from its parental generation with regard to allele frequencies simply because of random variation in the distribution of gametes. This process is more rapid in smaller populations, or when the alleles concerned confer no apparent benefit compared to their counterparts.

Standard 12
Biology

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