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9 Cards in this Set
- Front
- Back
define parental investment. |
any investment by a parent in an offspring that increases the chance that the offspring will survive at the expense of that parents ability invest in any other offspring (Trivers 1972) |
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what is at the heart of Trivers theory? |
that males and females do not invest equally. |
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why is this? |
females: eggs are numerous so more costly --> select males based on quality. males: potential unlimited offspring number --> compete for quantity of females. |
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what did daly and wilson 1978 say? |
males can opt out female cannot so males can devote little to parenting. |
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what does the parental investment theory state? |
that the sex making larger investment will be more sexually discriminating. Sex that invests less will compete for access to higher investing-sex. |
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what does this mean in humans? |
females are more discrimiting to choice in parter and males compete with other males for access to higher investing females. |
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why is female investment considered greater? |
they produce fewer gametes in lifetime. |
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how can female investment also be explained? |
by their parental certainty. |
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why do human females invest more? |
childbirth in humans occurs earlier due to increase in brain size since ancestory causing childbirth problems this requires more pronatal care from mothers (breast feeding). |