What is the relationship between the frequencies of three alleles of a gene in a population, and how do they add up to a specific value?

The relationship between the frequencies of three alleles of a gene in a population is that they must add up to 1 (100). This is known as the Hardy-Weinberg equilibrium. The frequencies of the three alleles can be represented as p, q, and r, and the equation p q r 1 must hold true in a population for genetic equilibrium to be maintained.