PSYCH 3F03 Lecture Notes - Lecture 6: Natural Selection, Genetic Drift, Selectin
Document Summary
Learning objectives: revisit the 3 criteria for evolution by ns, recognize how selection can act at multiple levels, list and understand 3 forms of ns, understand how genetic variation can be maintained in the face of selection. Evolution: a change in the frequency of an allele or genotype in a population over time. 5 mechanisms of evolution: (1) ns, (2) sexual selection, (3) mutatios, (4) gene flow (migration, (5) genetic drift three conditions of ns: Individuals within the population must vary in phenotypic traits. At least some of the variation must have a genetic basis (i. e. is heritable) This variation must influence reproductive success in terms of survival or reproduction natural selection: Natural selection: the differential survival and reproduction of individuals due to differences in traits. We can think about selection on multiple levels: Darwin"s primary view: natural selection acts on variation among individuals, causing some to reproduce more than others.
