PSYC 3100 Lecture Notes - Lecture 15: Heredity, Pair Bond, Parental Investment
3 Nov 2015
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Two main hypotheses: the parental cooperation hypothesis (aiello & key 2002): sexes form a breeding unit based on sexual division of labour. Maternal care costs are really high for homo. But: many mammals mate monogamously (say that 10 times!) and yet paternal care is. In one-male many-female polygyny, many males are excluded from reproduction there is an incentive to break the polygyny (rocks and sticks and coalitions are useful here - chimps use them especially to defeat rivals) Monogamy evolved from polygyny, and its high cost (the outcome was a broader. There are polygamous members in monogamous societies. It"s tough to have a harem - if you are hoarding all the mates, there will be a lot of pressure on the mates who aren"t reproducing to break the polygamy distribution of mates) Mate choice is likely to have a strong evolutionary component . The mate that you choose contributes roughly 50% of his/her genes to your offspring.
