BIOA02H3 Chapter 23: Species and their Formation--KEY TERMS & DEFINITIONS

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14 Apr 2011
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BIOA02H3 Full Course Notes
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Key terms chapter 23: species and their formation. species used to be classified based on appearance (morphological species concept) speciation is the process by which one species splits into two or more daughter species, which therefore evolve as distinct lineages. reproductive isolation: when individuals of a population mate with one another, but not with individuals of other populations, they constitute a distinct group within which genes recombine. biological species concept: species are groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups . 23. 2-how do new species arise? if two populations are isolated from each other, and sufficient differences in their genetic structure accumulate during the period of isolation, then the two populations may no exchange genes when they come together again. hybrids between two species may suffer from a range of defects, many of which are lethal.

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