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IB35ACS Study Guide

Transition 10000 o the demographic transition 200 o

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Unformatted text preview: increase in risk a person has if a parent or sibling is affected ● Altruism o increases the fitness of the recipient(s) at a cost to the actor ● How do we explain altruism? o Kin selection: helping family members may help your genes be passed on o Sexual selection: risk is worth the potential gain? o Tit for tat/reciprocal altruism ● Altruism with genetic basis: Reuter et al (2011) o COMT Val158Met polymorphism, twin studies: COMT gene, chr22 makes enzyme affecting breakdown of dopamine (interacts with oxytocin and vasopressin), all hormones affecting “prosocial behavior” o Other genes of interest: OXTR and AVPR1a ● Hominid evolution o Implications on: human mating adaptations, importance of biparental care, human foraging patterns, life history, general nature of human social org ● Estrus=ovulation = estrous cycle (estrus: noun, estrous: adj) / o estrus is recurring period of female sexual receptivity and fertility o phase of female sexuality occurring near ovulation o phase...
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