11-Macroevolutionnotes

11-Macroevolutionnotes - Macroevolution Macroevolution

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Macroevolution Macroevolution Ideas about how species arise and diversify Historical, unites paleontology and population biology Patterns of species distributions in time and space Speciation:   appearance of new species Extinction : complete disappearance of species Definition of species Once seemed simple…now less clear Must account for: Distinctiveness of species at a location Connection of different populations of a species Biological species concept: One or more populations of individuals that interbreed under natural conditions  to  produce fertile offspring Criteria for species Interbreeding must produce fertile offspring Horse X donkey   mule Infertile Interbreeding must occur under natural circumstances : Dog X coyote   coydog Fertile Usually does not occur in natural populations The beginning of species: speciation Gene flow maintains similarities among populations of a species
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11-Macroevolutionnotes - Macroevolution Macroevolution

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