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

  • [AIIMS 2014]
  • [AIIMS 2016]
  • A

    $0.21$

  • B

    $0.42$

  • C

    $0.36$

  • D

    $0.7$

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  • [NEET 2022]

In a random mating population in equilibrium, which of the following brings about a change in gene frequency in non-directional manner?