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 ?

1. 0.36 (AA); 0.48 (Aa); 0.16 (aa)

2. 0.16 (AA); 0.24 (Aa); 0.36 (aa)

3. 0.16 (AA); 0.48 (Aa); 0.36 (aa)

4. 0.16 (AA); 0.36 (Aa); 0.48 (aa)

Doubtly Asked 30 Oct 2026 NEET UG 2019 Practice test neet Save WhatsApp Report

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Answer: 3. 0.16 (AA); 0.48 (Aa); 0.36 (aa)

Key idea: Hardy-Weinberg: \(p^2 + 2pq + q^2 = 1\).

\(p = 0.4\), so \(q = 1 - 0.4 = 0.6\).

AA = \(p^2 = 0.16\); Aa = \(2pq = 2(0.4)(0.6) = 0.48\); aa = \(q^2 = 0.36\). Sum = 1.00, so option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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