Genetic factors in aggression SANS A03

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  • Created by: Katie
  • Created on: 27-01-20 14:19
what are the 3 ways of measuring the impact of genetics in agression
1. twin studies 2. adoption studies 3. MAOA gene
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what do twin studies aim to find
concordance rates within MZ twins
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who studied twins to find a link with aggression and genetics
coccaro et al.
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what did coccaro et al find for the concordance rates between DZ twins
19%
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what did coccaro find the concorance rate was for MZ twins
50%
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what do cocarro's findings suggest
a strong link between genetics and agression, but environment canot be ignored
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what do twin studies overall suggest heredibility accounts for in aggression
50% variance in agressive behaviour
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who do adopion studies study
any child who is given up for adoption but still shares characterisitcs with bio parents, even though never met
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who carried out a meta analysis on adoption studies
rhee and waldman
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what was their meta analysis focussed on
direct aggression ad anti social behaviour
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what did they find the % fthat genetic influences accounted for in aggression
41%
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who is this inline with
twin studies
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what is another name for the MAOA gene
warrior gene
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what is the MAOA gene, what does it do?
an enzyme that braks down important neurotransmiters in the brain
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what kind of neurotransmitter is broken down by MAOA
serotonin
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what happens if MAOA is too high
not enough serotonin
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what level of serotonin occurs with low MAOA
notenough serotoin being broken down
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who studied the Dutch family
Brunner e al.
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what kind of behaviours were these male family members involved in
aggressive - ranging from petty crime to ****
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what levels of serotonin and MAOA did the find in the family
low levels of MAOA, so high serotonin
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Who did Frazzetto study
children with the MAOA gene and maltreatd in childhood
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what model does Frazzetto support
diathesis stress
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why does his research suppor the model
found a link between MAOA and the environment
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what combination was the only one to result in aggressive adults
maltreated in childhood and low MAOA
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what do twin studies aim to find

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concordance rates within MZ twins

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who studied twins to find a link with aggression and genetics

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what did coccaro et al find for the concordance rates between DZ twins

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what did coccaro find the concorance rate was for MZ twins

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