Evolution (Diana Drake)

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http://www.youtube.com/watch?v=FpfAZaVhx3kevolution 05


A great example of this is the foot of a pig, more specifically one toe does not have any purpose. This is because it evolved over time.


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Homologous Features

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Analogous Features

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http://www.youtube.com/watch?v=CvrmZLGWfFs evolution 14

Natural Selection

evolution 15 evolution 16 evolution 17

Directional Selection


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Stabilizing Selection

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Disruptive Selection

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Sexual Selection

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Genetic Drift

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Bottleneck effect

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Reproductive Isolation

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Allopatric Isolation

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Sympatic Isolation

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