Parental Investment

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  • Created by: Tim Winks
  • Created on: 07-05-10 14:17

Sex Differences In Parental Investment

  • Males can walk away from investment into childcare in ways females can't, due to their high reproductive effort that takes place during mating and courtship. (Daly + Wilson)

Why do females invest more?

  • Human babies are born relatively immature, compared to other mammalian young, due to an enlargement of the skull.
  • In common with other mammels, female humans breast feed their young.
  • Due to the prolonged immaturity of a human infant, human females invest the most resources postnataly as well as prenataly.

Costs of maternal investment

  • Male costs of maternal investment are, at the minimum, sex and semen.
  • The minimum costs for females are nine moths pregnacy, followed by years of feading, carying and teaching.
  • This makes random mating by females a risky and costly action.



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