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Outline and evaluate the role of genes in
Genes do not directly cause aggression but influence elements of our biology that contribute to it. A
combination of structural and functional genetic effects contributes to aggressive behaviour.

Evidence for the effect of genes comes from 4 different sources of research.…

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example, O'Connor (1980) found that MZ twins reared together and apart were similar in their
aggressive characteristics and was higher than the rates in DZ twins. This suggests that there is a
strong genetic component in aggression as MZ twins share 100% of their genes compared to 50% in


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