lecture 3 - I II III The four ways that evolution can occur...

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I. The four ways that evolution can occur II. Sexual selection: Natural Selelction can create sex differences III. What is culture? The norm of reaction illustrates the relationship between nature and nurture Take home message #1: even complex behaviors can be changed by natural selection Agents of evolution natural selection Natural selection: non random elimination of alleles. Change in allele frequencies over time. Agents of evolution mutation A direct alteration of DNA so that one allele is changed to another. how can this occur??? Agents of evolution gene flow Gene flow: Within a population some individuals leave or new individuals arrive, thus changing the overall allele frequencies. Agents of evolution genetic drift Genetic drift: a random change n allele frequencies. how can this occur??? Take home message #2: evolution can occur via one of four agents: mutation, migration, genetic drift, or natural selection Sexual selection often, there’s conflict between reproduction and survival…
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This note was uploaded on 09/04/2008 for the course LIFESCI 15 taught by Professor Phelan during the Fall '07 term at UCLA.

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lecture 3 - I II III The four ways that evolution can occur...

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