BSC 1010 Chapter 22: The Origins of Species
15 Feb 2017
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The concept of species must account for two phenomena: Distinctiveness of species that occur together at a single locality. The connection that exits among different populations belonging to the same species. Sympatric: when two species or populations exist in the same geographic area & thus regularly encounter one another. Even if they look alike to us, the organism themselves have no such difficulties. Subspecies: a geographically defined population or group of populations within a single species that has distinctive characteristics. They are usually connected by intervening populations that are intermediate in their characteristics. Gene pools: all the alleles present in a species. Biological species concept: defines species as groups of populations that have the potential to interbreed & that are reproductively isolated from other groups. Populations whose members do not mate with each other or who cannot produce fertile offspring are said to be reproductively isolated, making members a different species.
