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NEET2019Zoology-Genetics

NEET 2019 Zoology Population Genetics MCQ Question

Type: MCQ-numerical-Medium-Class 12

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

A

0.16 (AA); 0.48 (Aa); 0.36 (aa)

B

0.16 (AA); 0.36 (Aa); 0.48 (aa)

C

0.36 (AA); 0.48 (Aa); 0.16 (aa)

D

0.16 (AA); 0.24 (Aa); 0.36 (aa)

Correct Answer

Option A

Detailed Explanation

Using Hardy-Weinberg principle: p = 0.4, q = 0.6. Homozygous dominant (AA) = p² = 0.16, heterozygous (Aa) = 2pq = 0.48, homozygous recessive (aa) = q² = 0.36.

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