A small population that breaks off from the main population, via some sort of isolation
Evolution from a common ancestor that results in diverse species adapted to different environments
Suggests that species often diverge in spurts of relatively rapid change, followed by periods of relatively no change
reminants of structures that may have once had important functions but appear useless now
similar structures (possibly w/ different functions) in species sharing a common ancestor
says that the population is not evolving, and the frequency of alleles in the gene pool is not changing over time
what occurs after a natural disaster that is sudden, when much of a population is affected/wiped out and genetic diversity is reduced.