ANT203H5 Chapter Notes - Chapter 4: Prosimian, Evolutionary Taxonomy, Hyoid Bone
Document Summary
Biological species concept - organisms from different populations are considered to be in the same species if they naturally interbreed and produce fertile offspring. Anagenesis: the transformation of a single species over time. Chronospecies: labels given to different points in the evolutionary lineage of a single species over time. As a species changes over time, the different stages are labeled as chronospecies in recognition of the biological changes that have taken place. Cladogenesis: the formation of one or more new species from another over time. The genetic isolation of populations that may render them incapable of producing fertile offspring. Elimination or reduction of gene flow between populations. Geographic isolation most common, behavioural isolation (feeding habits, awake during diff hours) Once gene flow has ceases other evolutionary forces will cause the species to diverge. Natural selection once thought to be the sole reason for speciation.
