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 these mechanisms 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 (change in allelic frequency within the population). 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 random in the ABSENCE of EVOLUTIONARY FORCES , allele frequencies will remain constant from one generation to the next. 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 equilibrium only if:
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Lecture_7_Evolution%20&%20Population%20Genetics_2%20Feb%202011[1]

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