PSYC 327 03.15.07 Lecture #15

PSYC 327 03.15.07 Lecture #15 - PSYC 327 03.15.07 A) Sperm...

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PSYC 327 03.15.07 A) Sperm Competition -females that mate with more than one male will have many kinds of sperm in her. -If sperm A and sperm B compete in a woman, the one that has a greater abundance will have larger chance of fertilizing female - testes mass (divided by) body mass -Gorillas have a smaller testes:mass: body mass ratio and have been correlated to more monogamy. -Small sperm are faster than larger sperm. The smaller sperm has a larger chance of fertilizing a female, and this causes a chemical change in the female that does not allow other sperm to penetrate egg. -some species have either hairs at the end of penis or a cork shaped penis that could remove potential sperm already in vaginal track. B) Group Living -In the past, without the help of transportation, humans used to mate within 25 miles of each other. -With high density of resources- tend to live together -Spread resources- tend to live more spread out -some species will isolate themselves with the resources -ie Cliff Swallows -young swallows that grow up in low density areas will go to low density areas when its time to mate -young swallows that grow up in high density areas will go to high density areas when its time to mate. -Cross Fostering- taking young from low density area and high density
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This note was uploaded on 04/07/2008 for the course PSYC 327 taught by Professor Miller during the Spring '07 term at Binghamton University.

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PSYC 327 03.15.07 Lecture #15 - PSYC 327 03.15.07 A) Sperm...

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