Question

Genetic Variation

Explain three cellular and /or molecular mechanisms that introduce variation into the gene pool of a plant or animal population.

Answer 1

1. Mutation - mutation in coding or non coding region creat more allele and increase gene pool size. Eg. A1 wild type, A2,A3, A4 ......A10 mutent

2. Differential reproduction (natural selection) -

A. assortive mateing - like same they mate, in this type homozygous allele increase. Eg.   pp alllele increase or qq allele increase

B. Non- assortive mateing - heterozygocity increase , pq allele frequency increase.

3. Migration - migration of allele between source or sink population also effect gene pool dye to allele frequency. Ex. In source population p=0.7 and q= 0.3 and same in sink population after immigration of q allele , in source p=0.7 q=0.3 but in sink p= 0.5 and q= 0.5.

Along with genetic drift also effect gene pool size in faster manner. This effect apply on small population or isolated population.