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Evolution: Constant Change and Common Threads  Lecture 2 – Selection in Action

Evolution: Constant Change and Common Threads Lecture 2 – Selection in Action

This lecture entitled Selection in Action, describes the comparison between the artificial selection of dogs and corn and the natural selection of the stickleback fish. On the one hand, genetic crosses in maize and dogs, propose that not many genetic changes are necessary to greatly transform the shape and structure of plants and animals. On the other hand, Ocean stickleback fish, colonized numerous freshwater streams and lakes produced by retreating glaciers after the last Ice Age. 

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