social evolution notes 1

social evolution notes 1 - R. Trivers Anthro 204 Spring...

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R. Trivers Anthro 204 Spring 2010 Natural Selection 1--What is it? Natural selection refers to variation in individual reproductive success (RS) where RS = # of surviving offspring, often measured one generation later (sometimes less, sometimes more). 2--and evolutionary change: When variation in RS acts on genetic variation, there is evolution--in the sense of genetic change over time. It is critical that mortality or variation in reproduction act non- randomly , that is, favoring some at the expense of others with reference to their genetic traits. There is also some genetic change which is purely random. This kind of change produces no particular organization nor logic. Only natural selection results in coherent patterns, genes that contribute to high survival and reproduction being favored 3--What does it consist of? mortality selection, mostly pre-reproductive variation in fecundity (parental investment, PI) sexual selection -the theory proposed by Charles Darwin that states that certain evolutionary traits can be explained by intraspecific competition . Darwin defined sexual selection as the effects of the "struggle between the individuals of one sex, generally the males, for the possession of the other sex".[1] Biologists today distinguish between
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This note was uploaded on 01/26/2012 for the course 70 204 taught by Professor Roberttrivers during the Spring '11 term at Rutgers.

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social evolution notes 1 - R. Trivers Anthro 204 Spring...

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