Present a rationale for using DNA sequence polymorphisms as an index of genetic

It is natural to expect that the forces that bring about speciation are dependent upon reproductive isolation. As groups of organisms become reproductively isolated (whether through development of geographic or genetic barriers), it is natural to expect that through the accumulation of mutations, DNA sequences will diverge. It is also natural to expect that some DNA sequences will diverge more rapidly than others and that some differences in DNA sequences may be more evolutionarily important than others. Therefore, whereas there may be a general relationship between genetic diversity and evolutionary (phylogenetic) diversity, it is likely that there are exceptions.