ANTH-101 Lecture Notes - Lecture 3: Genetic Drift, Kin Selection, Biproduct
10 May 2019
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Document Summary
Evolution: microevolution: changes in allele frequency within a species. May be rapid, within a few generations: populations: clustered, usually geographically seperated groups - same species, gene pool: all genes in all members of a species/populations, mutation: errors in info. Individuals don"t evolve, populations do: gene flow: exchange of genes between populations within a species. Prevents creation of new species: genetic drift: changes in gene frequencies, founder effect: small subgroup of larger pop. Often by migration: genetic bottleneck: form of genetic drift. Likely contributed to lack of genetic diversity in homosapiens: natural selection: unequal survival/reproductive success. Fit individuals more likely to pass on genes: sexual selection: traits improve reproductive fitness. Explains traits that decrease survivability: natural selection and human variation. Skin color likely an adaption to variation in ultra violet radiation. Varies depending on distance from equator: bergmann + allen"s rules: changes in body porportion due to climate. Cold: short and stocky: lactose persistence: lactose intolerance.
