BIOL10005 Lecture Notes - Lecture 24: Species, Genetic Drift, Speciation

• School: University of Melbourne
• Department: Biology
• Course: BIOL10005
• Professor: Dawn Gleeson

Document Summary

Species: groups of actually or potentially interbreeding populations which are reproductively isolated from other such groups. They are genetically and morphologically distinct from other such groups. Speciation is founded on the population genetic principles. Speciation is di erent from other aspects of population genetics as it concerns tracking genetic change in more than one population. Mutation, genetic drift and natural selection can lead to gradual genetic divergence between populations another, we may classify them as separate species. When populations have diverged so far that they are recognisably di erent from one restricted gene ow leads to: genetic and phenotypic di erentiation. Allopatric speciation geographic barrier a mode of speciation that occurs when biological populations of the same species become isolated from each other to an extent that prevents or interferes with gene ow. These barriers can arise from environmental di erences or from genetically-based. Exchange of alleles within a group would be expected to lead to similarity of characters.