Lecture18 - BioNB 2210: Lecture 18 Oct. 05, 2011 Lecture...

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BioNB 2210: Lecture 18 Oct. 05, 2011 Lecture 18: Monogamy Janet Shellman Sherman Key objectives of this lecture a. Be able to synthesize the theoretical explanations for why genetic and social monogamy occur in some species, whereas polygyny and polyandry occur in other species. b. Know key factors that allow us to predict genetic monogamy versus genetic polygamy among partners. c. Be able to tell us how and why sexual selection can operate in species with essential biparental care. ---- 1. Parental investment is defined as “any effort that raises offspring survival (and hence reproductive success) at the expense of a parent's ability to invest in other offspring” Robert Trivers 1972 Anisogamy sets up forces leading to sexual selection. Parental investment can accentuate or eliminate or even reverse those differences. But is monogamy simply the disappearance of sexual differences, with parental investment eliminating sexual selective pressures on both sexes? Two hypotheses generate current understanding
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This note was uploaded on 08/27/2011 for the course BIONB 2210 taught by Professor Seeley during the Fall '10 term at Cornell.

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Lecture18 - BioNB 2210: Lecture 18 Oct. 05, 2011 Lecture...

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