How can isolation and genetic drift lead to speciation?

1 Answer
Jul 28, 2016

Genetic drift is gene flow in a small population


If number of individuals in a population is small, the genes in next generation is without much variation. In a large population there is more chance in variation. Less variation in a small population makes individuals unique. This is the reason isolation makes formation of a new species. All islands have variations due to smaller genetic pool. That is genetic drift