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Anagenesis (215 words) |
 | When the population of an entire species changes on a genetic level without a split, it is called anagenesis, phyletic evolution, or simply evolution. |
| The opposite of anagenesis, cladogenesis, is when a species splits into two genetically-distinct populations adapted to different ecosystems or survival strategies. |
| Taxonomists, when determining whether a species has indeed drifted enough from the ancestral population through anagenesis to be considered a new species, may look for differences in both behavior and structure of an organism, especially on a genetic level. |
| Anagenesis Summary (575 words) |
| Evolutionary taxonomists such as Simpson use both cladogenesis and anagenesis in their classifications, arguing that taxonomic groups should be based on the branching points in evolution and the degree of difference between groups. |
| Anagenesis also know as "Phyletic change" is the progressive evolution of species involving a change in gene frequency in an entire population rather than a cladogenetic branching event. |
| Diagram contrasting Anagenesis and Cladogenesis from the University of Newfoundland |
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