BIOL 101 Chapter Notes - Chapter 7: Continental Drift, Sympatric Speciation, Disruptive Selection

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23 Mar 2018
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We know we have 2 species when they can no longer interbreed and produce fertile. This process requires separate evolution of two or more subsets of the original species. Defines species as groups of actually or potentially interbreeding natural populations . Limitation: can"t be applied to organisms that reproduce asexually, or to classify fossils. Official definition of species for our purposes: a group of organisms that can mate with. When one species splits into two species, each new species evolves as its own lineage. A lineage refers to all the populations descended from common ancestors. Each species has a history: it begins when a lineage splits in two and ends. Lineage species concept: based on ancestry either with extinction or with another split into two new species. Biological species concept: based on reproduction one another and produce fertile offspring . Speciation: the formation of two new species from an original species offspring.

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