PSYC 2850 - Human Sexuality - Class 2

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PSYC 2800
Thisis P S Y C2850- Human Sexuality N O T P S Y C2800

January 26 2011Chapter 11Pg 358363Read for class 4 next weekSex Education and Sexual Attitudes ContinuedSexual selection will be most intense as the potential for differential reproduction among males increasesIn monogamous primates males reproduce success is relatively similar so sexual selection is not intenseIn polygynous species male reproductive success varies greatly so sexual selection is intenseSexually selected traits vary as a function of mating systemWhy do males competeWhy do females chooseTo explain why this sex difference existed Robert Trivers formulated his Theory of Parental Investment Trivers noted that in typical species female provide the overwhelming bulk of parental care for offspringFemales are responsible for gestation parturition lactation nurturing protecting and feeding their youngFemale lifetime reproductive output relatively low and more or less equivalentOffspring survival important for femalesMale lifetime reproductive success potentially high much higher than that of femalesUnlike females the potential exists for enormous variation in reproductive success among malesMoulay Ishmail The Blood Thirsty888 1042 childrenth Largest female documentation is 69 children peasant in Russia in the 17Century Females represent valuable reproductive resources for malesAs such males will compete intrasexually for female mates and will copulate in a relatively indiscriminate manner whereas females will carefully select the male with which they will mateParental investment strategies determine mating strategiesIn sex role reversed species the opposite pattern holds true male invest more in offspring and are choosy whereas females compete intrasexually for malesExample JacanaIf males and females invest more equally in reproduction sexual selection may not lead to marked differences between the sexesWhat type of males should females chooseMales that contribute to the females reproductive success
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