Lecture_7_Evolution%20&%20Population%20Genetics_2%20Feb%202011[1]

Lecture_7_Evolution%20&%20Population%20Genetics_2%20Feb%202011[1]

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Chapter 4 – Population Genetics & Natural Selection (cont)
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REVIEW: In addition to selection (natural, sexual, artificial), what other mechanisms cause evolution? Mutations Genetic Drift Gene Flow
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Mutation
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Genetic drift Change in allele frequencies due to chance or random events. Particularly important in SMALL populations
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Genetic drift
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Gene flow Immigration and emigration
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Which of thesemechanisms of evolution generates adaptation? Mutations Genetic Drift Gene Flow Natural Selection
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II. Population Genetics Remember: Biological Evolution = genetic change in a population of organisms over time(changein allelic frequency within thepopulation). If all the allelic frequencies are constant from one generation to the next, then the population is not evolving .
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Hardy-Weinberg principle: In a population mating at randomin the ABSENCE of EVOLUTIONARY FORCES , allelefrequencies will remain constant fromone generation to thenext. George Hardy Wilhelm Weinberg
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Hardy-Weinberg principle: What are these “evolutionary forces?”
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Hardy-Weinberg principle: What are these “evolutionary forces?” 1. Mutations 2. Genetic Drift 3. Gene Flow 4. Natural Selection 1. Sexual selection
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Hardy-Weinberg principle: Sexual selection
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Allelic frequencies can maintain a Hardy-Weinberg
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