BIOL 302 Lecture Notes - Lecture 6: Theodosius Dobzhansky, Genetic Drift, Gene Flow
28 Sep 2017
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Bio302: lecture 6 (sept. 22nd) evolution as a framework for ecology. Why evolution? (cid:862)nothi(cid:374)g i(cid:374) (cid:271)iolog(cid:455) (cid:373)akes se(cid:374)se e(cid:454)(cid:272)ept i(cid:374) the light of evolutio(cid:374). (cid:863) theodosius dobzhansky: why would we expect this, explains patterns fossil record, diversity, historical perspective to look into the future. Life, by definition, has developed its variation through evolution. What is (cid:373)ea(cid:374)t (cid:271)(cid:455) (cid:858)evolutio(cid:374)ar(cid:455) for(cid:272)es(cid:859): mutation, natural selection, genetic drift, gene flow, sexual selection, recombination, all of these things help shape the relationship between living things and their environment (what ecology is all about) What is evolution: evolution: a change in the gene frequency of a population over time, decent with modification (focusing on the change through time of lineages) Adaptation: evolutionary process by which the traits of organisms. What is required for evolution by natural selection: heritability, phenotypic variation, fitness consequences, fitness: relative genetic contribution of an individual to the next generation, function of survival and reproduction.
