6.5a Gene Flow, Genetic Drift & Gene Pool

Genetic drift ultimately DECREASES allele frequency resulting in decrease in genetic variation. more impactful in a small pop. increases chance of inbreeding. Also reduces genetic similarity between OG and new pop...potential speciation? 

Gene flow INCREASES allele frequency resulting in an increase in genetic variation. It does however, close the gap, between the first pop and the second pop (as the second pop receives some alleles from the first one therefore the two pops become more similar). small pop.