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Unformatted text preview: or even within the same area if conditions change. It is reasonably easy to determine speciation characteristics associated with changes that occur through time. When fossils from one era are compared to fossils from distant eras, they can be very different. When these differences appear significant, the extremes are called different species. The term, phyletic speciation or anagenesis is used for a species that evolves into a new, different, species through time. Anagenesis is associated with directional selection. When new species arise from branches that diverge from an original species, we use the term cladogenesis. Cladogenesis is associated with divergent selection....
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.
- Spring '10