Chapter 16-Origin of Species - Chapter 16:The Origin of...

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Click to edit Master subtitle style Chapter 16:The Origin of Species Evolution: Speciation
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Same or Different
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Speciation If evolution is basically organisms changing over time, then changes could lead to the development of new species .
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Species A population of reproductively isolated organisms. Only members of the same species can reproduce together and produce fertile offspring in nature.
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Reproductive Isolating Mechanisms {3968F77D-4188-414E-9941-BB371C745F5A} Reproductive isolation {495D0E11-CC99-4B67-91CE-58E809495C42} Premating {3027F9F8-7AAD-4A8E-88F5-984521A9AD17} Geographic ogical {711052AC-2B63-43D5-83A4-1387A30E32FD} Postmating nviability poral ble gametes {293B3F5E-3AC2-4E66-ADF0-CA1AD1339B87} Hybrid infertility vioral incompatible
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Pre-mating Mechanisms These mechanisms prevent the mating act from taking place. Geographical Isolation Ecological Isolation Temporal Isolation Behavioral Isolation Mechanical Isolation
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Geographical Isolation Mating is prevented because the organisms don't live together . If one population of turtles lives in ponds while another lives in streams and they never leave their habitat, they will not encounter each other so they can't mate. This would qualify them to be considered different species.
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Geographical Isolation
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Ecological Isolation Two populations that use different resources may spend time in different habitats within the same general area . 750 species of fig wasps each breed in and pollinates the fruits of a particular species of fig, and each fig species hosts one and only one species of wasp.
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Ecological Isolation
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Temporal Isolation Mating is prevented because the two groups of organisms mate at different times or seasons. If one group of birds mates in the spring while another groups mate in the summer they will never mate with each other. This would qualify them to be considered different species.
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Temporal Isolation
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Behavioral Isolation Mating is prevented because the two groups of organisms don’t recognize each others mating behaviors .
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