▪ This principle states that allelic frequencies in a population are stable and remains constant from generation to generation, i.e., gene pool (total number of genes and their alleles in a population) is constant. This is called genetic equilibrium or Hardy–Weinberg equilibrium.
▪ It can be expressed as p2 + 2pq + q2 = 1 where p and q are frequencies of different alleles.
▪ Disturbances in genetic equilibrium results in evolution.
