Hardy-Weinberg law

• It states that, “Genes and genotype frequencies in a Mandelian population remain constant generation after generation if there is no selection, mutation, migration or random drift.”
• The frequencies of three genotypes for a locus with two alleles say A and a, will remain constant at p²AA , 2pq Aa and q²aa, where p and q are the frequencies of alleles A and a, respectively.
• The illustration of hardy-Weinberg law can be done in following ways,

1. Random union of gametes
2. Random mating among genotypes