PSYCH 1XX3 Lecture Notes - Lecture 2: Parental Investment, Homicide, Cuckold
6 Nov 2017
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Adaptations: biological traits that help an individual survive and reproduce in its habitat, perform specific functions that make an organism better suited to its environment. Natural selection: differential survival and reproduction of individuals due to heritable differences between them, 3 essential components: Differential reproduction (some will have more offspring than others) Stabilizing selection: selection against any departure from the species-typical adaptive design, keeping traits stable overtime. Darwinian fitness: average reproductive success of a genotype relative to an alternative genotype. Sexual selection: component of natural selection that acts on traits that influence an organism"s ability to obtain a mate. May even have negative consequences on organism"s survival skills, but still helps it reproduce (ex: peacock"s tail). Basically, it refers to the evolution of characteristics based on mating advantage, not survival advantage. Includes 2 subsets: female choice or intersexual competition and combat success or intrasexual competition.
