BIOA02H3 Lecture : Evolution (Lecture 1 Notes)
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BIOA02H3 Full Course Notes
Verified Note
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Document Summary
adaptation: particular structure, physiological process or behavior that makes an organism better able to survive and reproduce. Also the processes that leads to the persistence of that trait. most characteristics are influences by alleles at more than one locus. show quantitative variation instead of qualitative (eg: height) natural section in 3 ways: stabilizing selection: preserves average phenotype. one mean value of a trait that does the best suited in its environemtn and reproduce successfully. ex: human birth weight varies but there is optimal: directional selection: favors individuals that vary in one direction. adaptations to environement (geographic reasons, global warming, nomadism moving from one place to another, etc) shift in alleles that adapt to the environment they are in: disruptive selection: from the average favors individuals that vary in opposite directions. variation is created when individuals at either extreme are more successful than average individuals.
