A population containing a gene 'X' with two alleles 'Aa' is in Hardy - Weinberg equilibrium for gene 'X'. If the gene frequency of allele 'A' is 0.2, allele frequency of 'a' is :

The correct option is A 0.2
A population containing a gene 'X' with two alleles 'Aa' is in Hardy - Weinberg equilibrium for gene 'X'. If the gene frequency of allele 'A' is 0.2, the allele frequency of 'a' is 0.2. According to Hardy-Weinberg equilibrium, the allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.
So the correct option is 0.2