PSYCH 3F03 Lecture Notes - Lecture 6: Inbreeding, Natural Selection, Frequency-Dependent Selection
18 Oct 2020
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Learning objectives: 3 criteria for evolution by natural selection. Inidivudla within the population must vary in phenotypic traits: at least some of the variation must have a genetic basis (heritable, variation must influence reproductive success in terms of survival or reproduction. Natural selection leads to the evolution of adaptations: recognize how selection can act at multiple levels, on individuals, on genes, on groups, 3 forms of natural selection. Variants in the most extreme in one direction of the mean are favoured. Beak size in finches after drought: stabilizing (purifying) Variants closest to mean preferred (skinny graph) fly egg in flowers wasps birds: diversifying (divergent) Learning objectives: define dispersal and gene flow and understand their effects on evolution, dispersal: physical movement of individuals, gene flow; movement of alleles from one population to the other. Completely random: population bottleneck, founder effects, define 3 species concepts and their pros and cons, morphological.
