311DCh24 - Ch. 24 pg. 487506 Speciation origin of new...

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Ch. 24 pg. 487–506 Speciation – origin of new species; appearance of new species is the source of biological diversity Microevolution – changes confined to a single gene pool Macroevolution – evolutionary change above the species level Two basic patterns of evolutionary change 1. Anagenesis – also called phyletic evolution; accumulation of changes that gradually transform a given species into a species with different characteristics 2. Cladogenesis – branching evolution; splitting of a gene pool into two or more separate pools, which give rise to one or more new species; only cladogenesis can promote biological diversity by increasing number of species Species – Latin word meaning “kind” or “appearance” Biological species concept – defines a species as a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but are unable to produce viable, fertile offspring with members of other populations
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This note was uploaded on 02/01/2011 for the course BIO 311D taught by Professor Reichler during the Spring '08 term at University of Texas at Austin.

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311DCh24 - Ch. 24 pg. 487506 Speciation origin of new...

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