Sex that makes the smaller investment = compete for access to the higher investing sex. Higher investing sex is sexually discriminating.
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Maternal Investment
Females have far fewer gametes and are certain of their offspring
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Why?
Brain size increased in response to adaptive cues = more difficult childbirth. Born early in comparison and are therefore relatively immature - pre and postnatal investment
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Costs
Minimum female investment = 9 months and carrying/feeding. Minimum male = copulation. Random mating is all the more costly for females
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Extra Marital Affairs - Baker and Bellis
14% of population = products of. Marry a man with good resources but engage in extramarital affairs with 'studs'
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Benefits/risks of cuckoldry
Shop for genes/social support = abandonment and mate retention strategies (violence)
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Paternal
Men can father an unlimited amount of children/opt out/indiscriminate mating is much less costly for males
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Cuckoldry
When males do invest they do not want to waste their resources and energy in a child that is not theirs, reflected in grandparents
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Sexual and emotional jealousy
Buss - men worry about the fidelity while women worry about loss of resources. Men = the act while women = shift in attention
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Gehr
Clear differences in ANS arousal (heart rate) when shown the costs of parenting; biologically less prepared
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Men do invest - Reid
Due to clear benefits, men provide resources and restrict reproductive opportunities to invest more = healthier environments which reduces mortality risks
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Anderson
Men did not discriminate between 'real' children and step
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Buss
Men = sexual infidelity while women = emotional. Physiological arousal.
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Rowe
Depends upon characteristics/child/relationship/past experience
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AO3
Chimpanzee males do not invest = cultural learning or evolutionary change
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Other cards in this set
Card 2
Front
Females have far fewer gametes and are certain of their offspring
Back
Maternal Investment
Card 3
Front
Brain size increased in response to adaptive cues = more difficult childbirth. Born early in comparison and are therefore relatively immature - pre and postnatal investment
Back
Card 4
Front
Minimum female investment = 9 months and carrying/feeding. Minimum male = copulation. Random mating is all the more costly for females
Back
Card 5
Front
14% of population = products of. Marry a man with good resources but engage in extramarital affairs with 'studs'
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