B3 Ch 24 - Overview: That Mystery of Mysteries Chapter 24:...

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Chapter 24: the Origin of Species Overview: That “Mystery of Mysteries” The origin of species, or  speciation , is at the focal point of evolutionary theory b/c the appearance of new  species is the source of biological diversity Evolutionary theory must also explain how new species originate and develop through the subdivision and  subsequent divergence of gene pools   the fossil record reveals the cumulative effects of speciation over  vast tracts of time The term  macroevolution  refers to such evolutionary change above the species level We can distinguish 2 basic patterns of evolutionary change: anagenesis and cladogenesis  Anagenesis also called phyletic evolution, is the accumulation of changes that gradually transform a given  species into a species with different characteristics Cladogenesis also called branching evolution, is the splitting of a gene pool into two or more new species  only cladogensis can promote biological diversity by increasing the number of species
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This note was uploaded on 11/16/2008 for the course BILD BILD3 taught by Professor Henterheather during the Fall '08 term at UCSD.

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B3 Ch 24 - Overview: That Mystery of Mysteries Chapter 24:...

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