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
$0.21$
$0.42$
$0.36$
$0.7$
$^{\prime} XX ^{\prime}$ is a type of selection process in evolution $^{\prime} XX ^{\prime}$ promotes the population changes in one particular direction $^{\prime} XX ^{\prime}$ favours small or large sized individuals, mean size of population changes in $^{\prime} XX ^{\prime}$. Identify $^{\prime} XX^{\prime}$
The chance of elimination of genes from a small population is an example of
Natural selection where more individuals acquire specific character value other than the mean character value, leads to:
In a random mating population in equilibrium, which of the following brings about a change in gene frequency in non-directional manner?