lecture10 - BioNB 221: Lecture 10 Sept. 19, 2008 Lecture...

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BioNB 221: Lecture 10 Sept. 19, 2008 Page 1 Lecture 10: Sexual Selection I: Female Choice Professor Paul Sherman I. The Concept Of Sexual Selection (Darwin, 1871) A. Sexual selection refers to selection for traits that increase the mating success of some individuals over others of the same sex, whereas natural selection refers to selection for all traits that increase the overall survival and reproductive success of both sexes. B. Darwin proposed two components of sexual selection: 1. Female choice of mates (intersexual or epigamic selection). 2. Male-male competition for mates (intrasexual selection), C. Both components of sexual selection arise from the fundamental asymmetry in the size of the gametes produced by the two sexes : females produce small numbers of relatively large gametes; males produce large numbers of small gametes. In addition, females typically invest more than males in other forms of parental care (e.g., gestation and lactation in mammals). Differential parental investment
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lecture10 - BioNB 221: Lecture 10 Sept. 19, 2008 Lecture...

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