An is one of multiple forms of a gene. Each variation of a gene has a different sequence of , which are the building blocks of DNA.

In a hardy-weinberg population with two alleles, a and a, that are in equilibrium, the frequency of allele a is 0.1. what is the frequency of individuals with aa genotype? a) 0.42b) 0.20c) 0.32d) 0.81