Phyletic gradualism - PowerPoint PPT Presentation

Speciation

Speciation. A species is an interbreeding group of organisms When a population is somehow severed from the parent population and over time its gene pool is altered. Allopatric and sympatric. Allopatric speciation. Isolation is the result of a geographic barrier Ex. Galapagos finches

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Modes of Speciation

Modes of Speciation. Modes of speciation. There are different modes that can lead to the formation of new species: Sympatric and Allopatric speciation. Sympatric speciation. A single population divides suddenly into two reproductively isolated groups within the same geographical area .

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