BIOL 1602 Lecture Notes - Sympatric Speciation, Allopatric Speciation, Reproductive Isolation
25 Nov 2012
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Document Summary
We can recognize and identify many species by their appearance. Linnaeus described hundreds of species on the basis of their appearance morphological species concept. Each species starts at a speciation event and ends at either extinction or another speciation event, at which it produces two daughter species. Speciation is the process by which one species splits into two or more daughter species, which thereafter evolve as distinct lineages. The gradual nature of most speciation guarantees that in many cases, two populations at various stages in the process of becoming new species will exist. An important component to speciation is reproductive isolation. If individuals of a population mate with one another, but not with individuals of other populations, they constitute a distinct group within which genes recombine. Speciation that results when a populations is divided by a physical barrier. Is thought to be the dominant mode of speciation among most groups of organisms.
