PSY_1_SexRev - NOTE All course materials(class lectures and...

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NOTE NOTE All course materials (class lectures and discussions, handouts, examinations, Web materials) All course materials (class lectures and discussions, handouts, examinations, Web materials) and the intellectual content of the course itself are protected by United States Federal Copyright Law, and the California Civil Code. UC Policy 102.23 expressly prohibits Copyright Law, and the California Civil Code. UC Policy 102.23 expressly prohibits students (and all other persons) from recording lectures or discussions and from distributing or selling lectures notes and all other course materials without the prior written permission of the Instructor (see written permission of the Instructor (see http://policy.ucop.edu/doc/2710530/PACAOS-100 http://policy.ucop.edu/doc/2710530/PACAOS-100 ). ). Students are permitted to make notes solely for their own private educational use. Exceptions to accommodate students with disabilities may be granted with appropriate Exceptions to accommodate students with disabilities may be granted with appropriate documentation. To be clear, in this class students are forbidden from completing study guides and selling them to any person or organization. This text has been approved by guides and selling them to any person or organization. This text has been approved by UC General Counsel. UC General Counsel. Sex and Mating Why Is There Sex? Hedge against environmental change o Cold environments animals turn asexual, warmth increases sex No current reason for humans – phylogenetic inertia Protection against pathogens – Red Queen hypothesis o keep our genes shuffling to avoid pathogens that are targeting a specific genome 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. Imbalance men and woman act and look different Sexual Dimorphism In most of animal kingdom, females are much bigger than males.
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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 o Overt female choice- female choose the more attractive mate based on their overt behavior ie rams banging horns together – the sound of horns attracts females and the one that wins this battle gets the female o Cryptic female choice- – you can bombard an ovum with sperm and so many will be rejected. But some will be allowed (all sperm of same person) -Male babies do more rough-and-tumble play in the womb vs females -Higher activity in males starts in utero Sexual Selection: Male Structural Displays -Morphological display- extra huge unnecessary claw in crab -peacock feather display
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