ANTH 200Lg Test Review - ANTH 200Lg Test Review What...

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ANTH 200Lg Test Review What contributions did Malthus and Lyell make to evolutionary theory? Malthus: “struggle for existence”; populations increase geometrically; food supply increases arithmetically Lyell: Uniformitarianism; constant geologic process; geological process that occurs over a long period of time What is Natural Selection? The process that produces adaptations How do complex adaptations evolve? Adaptations evolve from competition among individuals Selection produces adaptations that benefit individuals Populations evolve, not individuals Complex adaptations arise from the accumulation of small random variations Continuous and discontinuous variations What are the necessary conditions for natural selection? Darwin’s Postulates o Competition due to limited recourses o Variations and differential reproductive success o Variation is heritable
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What are the three modes of selection? Stabilizing Disruptive Directional Why is mutation unique among evolutionary mechanisms? Only mechanism which creates new genetic variation, creates a chemical change in genetic sequence How/Why does population size influence genetic drift?
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