LIFESCI 3C03 Lecture Notes - Bird Nest, Brood Parasite, Sexy Son Hypothesis
22 Dec 2012
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Document Summary
Bateman"s principle: differences in investment drives selective pressures, large variance between reproductive success is the result. Female mate choice: what limits female reproductive success, access to nutrients/resources survival, lose a lot if they pick wrong parent. Females mainly chose men of high status. Preference for willingness to invest: la cerra study, found male with child most attractive. Sex is expensive: mixing genes can actually also be costly. Sex is beneficial: may clear up/mask bad genes in a gene line, allows for wider array of genotypes. Greater amount of diversity in offspring of sexual organism than asexual: avoiding putting all fruits in one basket, some animals can switch between being sexual and asexual depending on environment. Evolution of mating systems: switch being turned on and off in voles, dopamine is important for engagement of mongomous relationship, d2 receptor activation pair bonding, d1 pair bonding inhibited [so, dopamine release inhibits pair bonding]
