anth200jan30

Anth200jan30 - ANTH 200 The Forces of Evolution refers to ways in which evolution happens mutation only source of information and basic force of

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ANTH 200 January 30, 2008 The Forces of Evolution - refers to ways in which evolution happens - mutation only source of information, and basic force of evolution - natural selection – - gene focus - genetic drift (sampling error) - nonrandom mating - really four forces that act on mutations Mutation - only source of original variation in a population - most mutations are neutral; favorability or unfavorability determined by context - point (micro) mutations - macromutations Natural Selection - requires o mode of inheritance across generations o variation among individuals o environmental pressure favoring one trait over another Gene Flow - same as migration - “People are just DNA’s way of making more DNA” – Richard Dawkins, The Selfish Gene. Ex. Grand Canyon Squirrel Population – at one time, one big squirrel population, but as canyon cut deeper, two groups separated (stop at gene flow) Genetic Drift = Random sampling error. The Founder Effect -e.g. Pitcaim's Island
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This note was uploaded on 09/03/2009 for the course ANTH 200 taught by Professor Stanford during the Fall '08 term at USC.

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Anth200jan30 - ANTH 200 The Forces of Evolution refers to ways in which evolution happens mutation only source of information and basic force of

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