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?

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Q.
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 [2019]

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

2 0.36 (AA); 0.48 (Aa); 0.16 (aa)

3 0.16 (AA); 0.24 (Aa); 0.36 (aa)

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

Ans.
(4)

Frequency of dominant allele (A) = 0.4

Applying Hardy-Weinberg equilibrium; $p + q = 1$

$q = 1 - 0.4 = 0.6; p^{2} + q^{2} + 2 p q = 1$

Frequency of homozygous dominant genotype

$(p^{2} ∴ AA) = {(0.4)}^{2} = 0.16$

Frequency of heterozygous genotype

$(2 p q ∴ Aa) = 2 \times 0.4 \times 0.6 = 0.48$

Frequency of homozygous recessive genotype

$(q^{2} ∴ aa) = {(0.6)}^{2} = 0.36$

Solution

Q.
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 [2019]

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

2 0.36 (AA); 0.48 (Aa); 0.16 (aa)

3 0.16 (AA); 0.24 (Aa); 0.36 (aa)

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

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Solution

Q. 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 [2019]

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

2 0.36 (AA); 0.48 (Aa); 0.16 (aa)

3 0.16 (AA); 0.24 (Aa); 0.36 (aa)

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

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Q.
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 [2019]