genetic explanation

• What specific gene has been identified as being associated with violent crime?

  The 'warrior gene'
• What is the function of MAOA in the brain?

  MAOA breaks down neurotransmitters such as serotonin and dopamine
• How does the presence of the warrior gene affect MAOA production?

  It disturbs the production of MAOA, resulting in an abundance of neurotransmitters
• What is thought to cause aggression in individuals with the warrior gene?

  An abundance of neurotransmitters such as serotonin and dopamine in the brain
• What specific case study supports the warrior gene theory?

  • Brunner studied a family in the Netherlands
  • Family had a history of violent aggression in the male line
  • Results showed the warrior gene was present in the family members
• What violent acts were committed by the men in Brunner's case study?


  One man raped his sister, and another ran down his boss with his car
• What did Stuart (2014) find in his study of men who assaulted their wives?

  Men with the warrior gene were the most violent
• What is the alternative theory regarding the warrior gene and violent traits?

  • The warrior gene must be coupled with childhood trauma
  • This combination brings about violent traits
• How was the warrior gene used as defensive evidence in a criminal court in America in 2007?

  A man facing the death penalty had his sentence reduced to manslaughter due to the warrior gene and a history of abuse
• What were the implications of the 2007 case involving the warrior gene in the criminal justice system?

  It was revolutionary as genetic evidence had never been used in this way before
• What concerns arise from the potential for more evidence supporting genetic factors in aggression?

  More violent criminals may have their sentences altered and avoid responsibility for their crimes