Which psychologist found, using adult twin pairs, that nearly 50% of the variance in direct aggressive behaviour could be attributed to genetic factors?
Coccaro et al, 1997
1 of 10
Which type of twins share all the same genes?
Monozygotic
2 of 10
Which type of twin share only 50% of genes?
Dizygotic
3 of 10
If MZ twins are more alike in terms of aggressive behaviour ...
then this should be due to genes rather than the environment
4 of 10
Adoption studies can help to untangle?
the relative contributions of environment and heredity in aggression
5 of 10
Which study, of over 14,000 adoptions in Denmark found that a significant number of adopted boys with criminal convictions had biological parents with criminal convictions providing evidence for a genetic effect?
Hutchings and Mednick, 1975
6 of 10
Which gene is responsible for producing a protein that has been associated with aggressive behaviour? it regulates the metabolism of serotonin in the brain
Monoamine Oxidase A (MAOA)
7 of 10
Who conducted a study of a Dutch family and found that many of its male members behaved in a particularly violent and aggressive manner, (**** and arson) they were found to have abnormally low levels of MAOA in their bodies?
Brunner et al
8 of 10
500 male children - which researchers discovered a variant of the gene associated with high levels of MAOA and a variant with low levels. Those with low levels were more likely to grow up with antisocial behaviour only if maltreated as a child
Caspi et al. 2002
9 of 10
A series of adoption studies in which the criminal history of an adopted male was compared with the criminal history of both his biological and his adoptive fathers, found that genetic influences were significant in cases of property crime
Brennan and Mednick
10 of 10
Other cards in this set
Card 2
Front
Which type of twins share all the same genes?
Back
Monozygotic
Card 3
Front
Which type of twin share only 50% of genes?
Back
Card 4
Front
If MZ twins are more alike in terms of aggressive behaviour ...
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