The effect of genetics on aggression

• What does the genetic explanation of aggression argue?

  Some genes predispose aggressive behavior
• What is the MAOA gene also known as?

  The 'warrior gene'
• How does the MAOA gene affect serotonin levels?

  It makes the brain insensitive to serotonin
• What is the consequence of having the warrior gene?

  Reduction of control over impulsive behavior
• What evidence supports the genetic explanation of aggression?

  Twin studies show higher concordance in MZ twins
• What did Coccaro et al compare in their study?

  Monozygotic and dizygotic twin pairs
• What was the concordance rate for MZ twins in Coccaro et al's study?

  50%
• What was the concordance rate for DZ twins in Coccaro et al's study?

  19%
• Why is the MAOA gene significant in the context of aggression?

  It has a dysfunctional version linked to aggression
• In which country was a family with a dysfunctional MAOA gene studied?

  The Netherlands
• How does the MAOA gene affect males and females differently?

  Males are more affected due to one X chromosome
• What is a weakness of the genetic explanation of aggression?

  It does not account for nurture influences
• What do twin studies reveal about concordance rates for aggression?

  They never found 100% concordance in MZ twins
• What does a holistic explanation of aggression include?

  Both genetic and environmental factors
• What are the key findings from twin studies regarding aggression?

  • MZ twins show higher concordance rates (50%)
  • DZ twins show lower concordance rates (19%)
  • Supports genetic influence on aggression
• What are the strengths and weaknesses of the genetic explanation of aggression?

  Strengths:

  • Supported by twin studies
  • Links specific genes to aggression

  
  

  Weaknesses:

  • Ignores nurture influences
  • No 100% concordance in MZ twins