First Half ff - First Half Definitions Evolution: Change in...

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First Half Definitions Evolution: Change in genetic makeup (gene frequencies) of populations over time (generations) Microevolution: Gradual change occurring below species level Darwin/Wallace Theory of Natural Selection Organisms are variable at the level of individuals Individual characters are heritable by offspring More organisms are produced than can survive Natural selection leads to survival of best adapted (fittest) Surviving individuals pass on characters leading to gradual population changes over long periods of time Macroevolution: evolution occurring on a grand scale of time and geography Modern Ideas in Macroevolution (S.J. Gould) Extinction events are more common than we think and there is no adaptation for these meaning chance can play a role as to which major groups dominate. Right place/time. Theory of Punctuated Equilibria: Evolution may occur by rapid bursts followed by periods of tranquility. Ex: Ferns rapidly replacing conifers when Earth cooled in Permian. Species Concept
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This note was uploaded on 02/21/2012 for the course BIO Bio2137 taught by Professor Namroud during the Fall '11 term at University of Ottawa.

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First Half ff - First Half Definitions Evolution: Change in...

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