Lecture_6_Evolution_31Jan2011

Lecture_6_Evolution_31Jan2011 - Ecology and Evolution are...

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Ecology and Evolution are inextricably connected. Ecology = the study of interactions between organisms and their environment Evolution = ??? Write YOUR definition
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Ecology = the study of interactions between organisms and their environment Evolution = change in the frequency of one or more alleles in a population’s gene pool from one generation to the next. Evolution through natural selection is the mechanism by which organisms adapt to a changing environment
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“…there can be no question that the theory of evolution through natural selection has been the single most fruitful piece of biological thinking ever produced” Arms & Camp, 1987, p. 348
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Charles Darwin
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Alfred Russel Wallace
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Evolution through natural selection is the mechanism by which organisms adapt to a changing environment. Evolution can also occur through mutations, gene flow , and genetic drift . Only natural selection generates adaptation Today we will focus on natural selection
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What are the four premises upon which the Darwin - Wallace theory of evolution through natural selection is based? In other words, what is the mechanism of natural selection?
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1. Organisms beget like organisms.
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1. Organisms beget like organisms (heritable ). 2. There are chance variations between individuals in a species. Some variations are heritable.
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3. More offspring are produced each generation than can be supported by the environment.
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3. More offspring are produced each generation than can be supported by the environment. 4. Some individuals, because of their physical or behavioral traits, have a higher chance of surviving and reproducing than other individuals in the same population.
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Peppered Moths Short-term outcome of evolution through natural selection is ___________ adaptation
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Adaptation Long-term outcome of evolution through natural selection is ___________ speciation
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This note was uploaded on 04/12/2011 for the course BIO 326 taught by Professor Gehring,c during the Spring '08 term at N. Arizona.

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Lecture_6_Evolution_31Jan2011 - Ecology and Evolution are...

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