L567 lecture 13 - L567. Lecture 13. Last time. Evolutionary...

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L567. Lecture 13. Last time… Evolutionary stability of sexual reproduction ( i.e., when is a sexual population stable to invasion and replacement by an asexual clone? ) A. the cost of producing males (the “cost of sex” Maynard Smith 1978 ) Aside 1: effect of sex ratio on the cost of sex… Aside 2: Williams’ “cost of meiosis” B. the macroevolutionary hypotheses. (these are about speciation (Stanley) and extinction (Nunney) rates.) C. the microevolutionary hypotheses. 1. Mutation Clearance Muller’s Ratchet. Kondrashov’s Hatchet. 1
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L567. Lecture 13. This time… 2. the adaptive variation (ecological genetic) hypotheses. Aside 3: The Sex vs Recombination (individual vs group level advantages to sex) Aside 4: Hard vs Soft vs Density Dependent vs Freq-Dependent selection… A. The lottery model (hard selection in a temporally variable environment [Williams 1975]) B. The Tangled Bank model (Soft selection in a spatially variable environment [Bell 1982]) C. The Red Queen model. (time lagged frequency- dependent selection due to parasite-host coevolution [Jaenike 1978; Hamilton 1980]) a. data b. problems on theory D. Pluralist models. (West et al 2001) 2
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L567. Lecture 13. Here are some of the key points that I want to make. 1. William’s lottery model was the favored model from 1975 until 1982. The basic idea of the lottery model is that sexual reproduction should be favored because it increases geometric mean fitness in a temporally variable environment.
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This note was uploaded on 07/01/2011 for the course L 567 taught by Professor Curtis during the Fall '10 term at Indiana State University .

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L567 lecture 13 - L567. Lecture 13. Last time. Evolutionary...

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