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Essay Plan: Discuss Genetic factors in aggressive behaviour AO1 | Aggression has a higher concordance rate in MZ twins the DZ twins. Explain why this is important.Mc Guffin and Gottesman found a concordance rate of 87% for MZ twins in contrast to 72% in DZ twins.Therefore … | AO1 | A meta analysis by Mason & Frick stated that 50% of antisocial behaviour could be attributed to genetics and Coccaro et al concluded that genetics accounted for more than 40% of individual differences in all types of aggression. | AO1 | Adopted studies, found there is a higher correlation between aggression and an adopted child’s biological parents to their adopted parents. Explain why this is important. Then Hutchings and Mednick looked at over 14000 adoptions in Denmark and found a positive correlation between violent convictions of biological parents (mostly fathers) and their adopted sons.Therefore | AO1 | There have been a few genes which have been identified as determinates for aggression. Brunner found that a family in Netherlands had a defect in a gene MAOA, which breaks down excess dopamine and noradrenaline. It had been suggested found that excess dopamine and noradrenaline may be a reason for high aggression. All boys within this family were highly aggressive suggesting …. | AO2 | Criticism for MZ & DZ data: P Evans and Martin argue that MZ twins are often treated more similarly than DZ by teachers, parents and peers.EE | AO2 | Criticism for adopted children: P: Adopted children are angry at being adopted. Parents who give up their children are also shown to have higher antisocial behaviour. E: It may be children are exposed to antisocial behaviour before they are adopted and learn the behaviour rather than genetic.E | AO2 | Methodological Criticism: P: There are methodology problems with meta-analysis studies, where some data is collected through observation and some through self-report questionnaires and interviews. E: It was discovered