PSY_1_Sex

PSY_1_Sex - Sexual Reproduction Why Is There Sex? Hedge...

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Sexual Reproduction
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Why Is There Sex? Hedge against environmental change No current reason for humans – phylogenetic inertia Protection against pathogens – Red Queen hypothesis
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Gametes (Sex Cells)
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The Sexes and Sexual Selection “Female” – sex that makes the larger parental investment per gamete. “Male” – sex that makes the smaller parental investment per gamete. Sexual selection – a type of natural selection in which members of one sex compete for reproductive access to members of the other sex. The means of competition can be structural or behavioral, and often lead to sexual dimorphism .
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Sexual Dimorphism In most of animal kingdom, females are much bigger than males. One major exception is in species with proportionally large brains. In those species, males compete for females with displays of strength and prowess. Females choose mates based in part on these displays Overt female choice Cryptic female choice
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Sexual Selection: Male Behavioral Displays
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Rough-and-Tumble Play in Rhesus Juveniles
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Sexual Selection: Male Structural Displays
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Experimentally Exaggerated Sexual Dimorphism: Widow Birds
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Incitement
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Mating Systems Monogamy - pair-bonding Polygamy – one animal has many mates Polyandry – one female mates with many males Polygyny – (harem) – one male mates with many females Promiscuity
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Mating Systems in Birds and Mammals
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Lion Mating
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Promiscuity in Chimpanzees
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Some Features of Human Mating System I Monogamy w/ Some polygyny Male > Female Preference for sexual variety More diverse arousal patterns Fetishes Exhibitionism Criminal patterns: rape, child sexual abuse Numbers of partners - - males are: less pickier less careful
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Mating systems: Standard Cross-Cultural Sample (186 Cultures) Most human cultures allow polygyny In those cultures, polygyny is restricted to the well-to-do
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PSY_1_Sex - Sexual Reproduction Why Is There Sex? Hedge...

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