The tendency of population to remain in genetic equilibrium may be disturbed by

Correct Option (d) Reason : According to Hardy-Weinberg principle, allele frequencies in a population are stable and is constant from generation to generation only if the following conditions are met

(i) There is no mutation, no gene flow and all mating is random.

(ii) All genotypes reproduce equally well (i.e., no natural selection). But all there conditions are rarely met in nature.