evolution 2

evolution 2 - Define Species & Speciation Speciation is a...

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Speciation is a lineage-splitting event that produces two or more separate species. http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_41 A species is often defined as a group of individuals that actually or potentially interbreed in nature. In this sense, a species is the biggest gene pool possible under natural conditions. That definition of a species might seem cut and dried, but it is not — in nature, there are lots of places where it is difficult to apply this definition. For example, many bacteria reproduce mainly asexually. The definition of a species as a group of interbreeding individuals cannot be easily applied to organisms that reproduce only or mainly asexually . Also, many plants, and some animals, form hybrids in nature. Hooded crows and carrion crows look different, and largely mate within their own groups — but in some areas, they hybridize. Should they be considered the same species or separate species?
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This note was uploaded on 08/06/2011 for the course BIO 15 taught by Professor ?? during the Winter '09 term at UCLA.

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evolution 2 - Define Species & Speciation Speciation is a...

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