BIO120H1 Lecture Notes - Lecture 8: Melanism, Michael Majerus, Oncomouse
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BIO120H1 Full Course Notes
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Lecture 8 notes: darwin predicted the existence of the moth, pollen grains, front end of the face, types of selection, determining the mechanisms of selection, evolution by pollution, Experimental evolution: fitness relative genetic contribution of individuals to next generation as a result of differences in viability and fertility (= darwinian fitness) Selective advantage some individuals better adapted to the environment and thus have higher fitness. Natural selection all organisms, selection by abiotic and biotic environment, no purpose or goal; simply a blind mechanistic process with no foresight all. Organisms: quantitative traits, variance in addition to the mean, stabilizing selection favours average traits, disabling selection favours one extreme, Disruptive selection favours both extremes, deterministic predict its effect on a certain trait. Grants: disruptive selection beak size african finches leads to character divergence and in some case may lead to speciation, requires spatial heterogeneity or discrete resources, discontinuous distribution, struggle to determine the mechanisms of selection.
