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A population is in Hardy-Weinberg equili...

A population is in Hardy-Weinberg equilibrium for a gene with only two alleles. If the gene frequency of an allele 'A' is 0.7, genotype frequency of 'Aa' is

A

`0.49`

B

`0.42`

C

`0.21`

D

`0.09`

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The correct Answer is:
B
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