lecture15

lecture15 - Life Science 15: Concepts and Issues Lecture...

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Life Science 15: Concepts and Issues Lecture 15: Reproduction and mating systems 2/28/12 I. What is a mating system? II. How does an embryo become male or female? III. Symmetry, heterozygosity, and beauty IV. Another mysterious motivator: the waist-to-hip ratio Mating System Definitions: Based on populations Polygyny o [high variance in male RS]/[low variance in female RS] o one male bonds with multiple females Polyandry o [low variance in male RS/high variance in female RS] o one female bonds with multiple males Monogamy o Low variance in both, low number of mates each o One female bonds with one male Sexual dimorphism is considered a very good predictor of mating systems. Larger sex is the competing sex with high variance in their RS. Biological constraints make reproductive investment asymmetric. The more asymmetric the investment: The more radical the sexual dimorphism Physical Behavioral Male competition Why would we see more monogamy in birds than mammals? How is the mating game different with external fertilization?
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lecture15 - Life Science 15: Concepts and Issues Lecture...

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