Discuss role of genetics in aggressive behaviour
- Created by: Dorothy Edgar
- Created on: 10-03-15 09:58
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- Discuss role of genetics in aggressive behaviour
- AO1
- Aggression often runs in families indicating a particular gene may be responsible for a predisposition to engage in Agg. Beh.
- Coccaro investigated 182 Mz twins and 118 Dz twins and found genes accounted for more than 40% of variance in general aggression
- Lagerspetz (1979) mice isolated after weaning. Aggressive and non agg. interbred. After 19th gen, aggressive biting behaviour 52% for agg. 5% for non agg.
- Hutchings and Mednick study of over 14000 people. Found sig no. of adopted boys with criminal convictions had biological parents with criminal convictions.
- Brunner et al found all male members of a Dutch family had defective MAOA gene and had been involved in criminal acts inc. **** and arson.
- Cases et al. (1995) dsables MAOA gene in X chromosome of mice and found that males became more aggressive
- Low activity MAOA-L and high activity MAOA-H, MAOA-L predisposes an ind. to antisocial and aggressive behaviour.
- Aggression often runs in families indicating a particular gene may be responsible for a predisposition to engage in Agg. Beh.
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