Assertion :Hardy-Weinberg principle explains the variations occurring in population and species over a number of generations. Reason: Hardy-Weinberg principle is applicable only when genetic drift occurs.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
The relative frequencies of various kinds of genes in a large and randomly mating, sexual panmictic population tend to remain constant from generation to generation in the absence of mutation, selection and gene flow. This is called Hardy-Weinberg principle or Hardy-Weinberg equilibrium. It is random in gene (allele) frequency and occurs only by chance. It is non-directional. Genetic drift can cause the elimination of certain alleles or fixation of the other in the population. Leading to a change in the population of alleles in the gene pool. So, genetic drift must not occur to maintain the equilibrium.
So, the correct answer is 'Both Assertion and Reason are incorrect'.

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