Which of the following is not a condition required to maintain constant allele frequencies of a gene in a population (Hardy-Weinberg Equilibrium)?

Mating is random

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No natural selection is occurring

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No mutations occur

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The population is small

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Solution

The correct option is B The population is small
Hardy Weinberg law or equilibrium does not apply for small populations. For a small population multiple factors like gene flow, genetic drift, non random mating etc disturbs the equilibrium or the value of the equation to a large extent.
So, the correct answer is 'The population is small'

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