State and explain any three factors affecting allele frequency in population.

Explanation

Factor effecting allele frequency in population are as described below
(i) Mutations These are suden heritable changes in which are supposed to be the primary source of genetic variation. Theya are of following tw types.
(a) Chromosomal Mutations They arise due to changes in chromosomes number and changes in structure.
(b) Gene Mutations These are changes in gene structure and expression due to addition, deletion, substitution or inversion of nucleotides.
(ii) Non-random Mating Repeated mating between individuals of certain selected traits changes trhe gene frequency , e.g., selection of more brightly coloured male bird by a female bird may increase the gene frequency of bright colour in the next generation.
(ii) Gene Flow ( Gene Migration ) It is the movement of alleles into and out of a gene pool. Breeding of immigrants with the host population adds new alleles to the gene pool of the host population.