Genetics (AQA A-Level Psychology): Flashcards
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Genetic explanation of offending
Genetic explanation of offending
Inherited genes form foundation of criminal behaviour
What are concordance rates?
What are concordance rates?
Similarity levels between twins
MZ vs DZ twins: % genes shared
MZ vs DZ twins: % genes shared
MZ: 100%, DZ: ~50%
Christiansen (1977) MZ concordance
Christiansen (1977) MZ concordance
35% for criminal behaviour
Cambridge Study: % families with 50% convictions
Cambridge Study: % families with 50% convictions
6% of families
Noradrenaline & offending
Noradrenaline & offending
Elevated levels link to violence & aggression
Serotonin & offending
Serotonin & offending
Low levels = reduced impulse control
Dopamine & crime
Dopamine & crime
Linked to addiction & substance abuse
MAOA gene effect (Brunner 1993)
MAOA gene effect (Brunner 1993)
Affects neurotransmitters → aggression & violent crime
Rhee & Waldman (2002) finding
Rhee & Waldman (2002) finding
59% of crime from genetic + environmental factors