Thus morning sickness may be used to help expel

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Thus, morning sickness may be used to help expel teratogens See the following correlation: More we see morning sickness happening, less miscarriages we see Aversions of cravings for women Lighter bar is craving and darker for aversion More aversion for meat More aversion for non-alcoholic beverages More people avoid veggies than craving...why? veggies produce more toxins as opposed to fruits
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Sexual selection Differential reproductive rates : sperm-producing organisms have higher reproductive rate than egg-producing Differential variance in reproductive success : Much high variances in male reproductive success Operational sex ratios: vary widely in population you’re in. Tells you the level of intra- sexual competitions. If more egg-proucing available to reproduce in a single time (more competition will be seen b/t the egg producing) Parental investment : In humans, egg-producing have higher basal metabolic reproductive success than sperm-producing. Lead to… intrasexual competition: within 1 species intersexual choice: b/t 2 species Why Dominance? 2 reasons why be might see dominant hierarchy in humans Dominant hierarchies fall out of competition Looking at operational sex ratios in humans, we can look at societies around world and figure out if we are monogamous species or not: o Culture makes us be monogamous , but we are not bound to that, we are not monogamous o Face-to-face society: primary motive communication is face-to-face (those not using technology, Ex: hunter gatherers) o Polyandry : egg producing sex has multiple sperm producing partners in a given cycle (like menstruation cycle) o We are actually a polygynous species : sperm producing often has more than one mate
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