Genetic,Plant Breeding


It is the fundamental law of population genetics and provides the basis for studying Mendalian population. This law was independently developed by hardy (1908) in England and Weinberg (1909) in Germany.

The Hardy-Weinberg law states that, the gene and genotype frequencies in a Mendalian population remain constant generation after generation if there is no selection, mutation, migration or random drift.

The frequencies of the three genotypes for a locus wilt two alleles, say ‘A’ and ‘a’ would be p2 (AA) 2 pq (Aa), q2 (aa)

where, ‘p’ represents the frequency ‘A’

‘q’ represents the frequency ‘a’.

The sum of p and q is one.

        P + q =1

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