ANTH 1001 Notes 2-12

ANTH 1001 Notes 2-12 - ANTH 1001 Notes/ 2-12-08 Test Thurs....

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ANTH 1001 Notes/ 2-12-08 Test Thurs. Feb. 21 Forces of Evolution Allelic Variability W/in Pop Allelic Variability between populations Mutation ↑↑ Increases Increases (pops become dissimilar from one another) Gene flow ↑↓ Increase Decrease (become more similar) Genetic Drift ↓↑ Decrease (b/c the ultimate outcome is fixation of one allele) Increase (they become dissimilar because in one pop, the A may become fixed; in another B might be fixed.) Natural Selection ↓ ↑ Decrease Increase (pops will diverge from one another as long as there’s no gene flow Gene Flow: *Only gene flow promotes homogeneity -can be characterized by: (a) contact between neighboring populations or (b) large scale migration Adaptedness (y) vs. Time –gene flow (x) bell curve, at half down, turns back upward and raises above the pea -inhibits (i.e. retards) speciation (the origin of a new species) -Def.- Species- group(s) of (actually or potentially) interbreeding organisms that are reproductively isolated from other such groups Origin of a species: Consider a species to consist of four pops.: A,B,C, and D. Species 1: A,B,C,D
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ANTH 1001 Notes 2-12 - ANTH 1001 Notes/ 2-12-08 Test Thurs....

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