Anagenesis+vs.+Cladogenesis

 Phyletic evolution or anagenesis is all the changes that gradually change a given species into a species that has different characteristics(1). During this process the species evolves without splitting the tree(2).

 Branching evolution also called cladogenesis is when the gene pool splits into two or more separate pools, which can create one or more new species. Cladogenesis is the only one that can promote biological diversity(1). It does so by increasing the number of species. In cladogenesis, new taxas branch off of the common ancestral lineage(3).

(1). AP Biology Book page 472 (2). http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-A/anagenesis.html (3). http://www.thefreedictionary.com/cladogenetic (4). http://www.mun.ca/biology/scarr/Cladogenesis_vs_anagenesis2.gif (5). http://www.mc.maricopa.edu/dept/d10/asb/origins/selection/natselpicts/anagenesis.gif

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