BISC 1112 Chapter Notes - Chapter 24: Speciation, Disruptive Selection, Gene Flow
31 Mar 2017
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Allopatric speciation different forms of sympatric speciation. Evolutionary processes created diversity of life on earth so these processes must be ongoing. Speciation: the process by which one species splits into two or more species. Microevolution: changes over time in allele frequencies in a population. Macroevolution: the broad pattern of evolution above the species level. Ex. origin of new groups of organisms, such as mammals or flowering plants, through a series of speciation events. 24. 1: the biological species concept emphasizes reproductive isolation. Biological species concept: a species is a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but do not produce such offspring with members of other such groups. In this class, we will focus on this species definition. Gene flow tends to hold populations together genetically causing members of a species to resemble each other more than they resemble members of other species.
