How can Hardy-Weinberg equilibrium be affected ? Explain giving three reasons.
(1) Genetic drift : If the same change occurs by chances / new genes / alleles are added to the now population and these are lost from old population.
(2) Mutation: Pre - extisting advantageous mutation when selected will result in new phenophytes.
(3) Natural selection: Heritable variations enabling better survival enable organisms to reproduce and leave greater number of progeny.