CAS AN 102 Study Guide - Final Guide: Endocrine System, Limiting Factor, Parental Investment
27 Mar 2014
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Document Summary
How did sex evolve: population of gametes of various sizes, disruptive selection against middle sizes, selection for small and big gametes, initial inequality of investment: females with large gametes, males with small gametes. Female and male have different investments in reproductive successs. Produce large, limited number of egg cells. Energetic constraints on reproduction and child survivorship (food) for females. Ability to find and retain a mate for males. Natural selection: must be variation in trait, trait must be heritable, there must be differential reproductive success. Reproductive success: leaving more copies of your genes in subsequent generations than do other individuals in your population. Limited by ability to find a mate, energetic constraints on reproduction, offspring survival. Naturalistic fallacy: just because something occurs in nature it doesn"t mean it is right or justified. Can also result in things we admire: cooperation, friendship, love. Three forms of sexual selection: intra-sexual competition, inter-sexual choice, inter- sexual coercion.
