AO3

• Coccoro - twin studies


  aggression has high levels of hereditability

  50% for MZ twins

  19% for DZ twins

  aggression is highly genetic as MZ twins share 100% of their DNA so more likely to have higher levels of aggression
• Stuart et al +


  Ev - studied 97 men in domestic abuse cases to their partners, the most violent had the faulty MOAO gene

  Ex - genetic likely to be valid as research done on humans showing causal relationship

  El - increase psychology reputation and helps develop treatment

  C - small sample size limits generalisability
• Godar et al


  removing key genes can affect aggression

  removed MOAO gene from mice they showed increased aggression and higher levels of serotonin when given fluoxetine