· Mednick et al (1987) showed that children resembled their criminal biological parents rather than their adopted ones
· Retz et al (2004) specific 5- HTTLPR gene – links to violent behaviour
· Dabbs et al (1995) higher testosterone levels in criminals
· Virkkuken et al (1989) low serotonin turnover is linked to aggressive behaviour
· Bohman replicated Mednicks study proving clear biological support
· Genes control biological processes, so could have some affect
· Limited due to environmental factors
· Twin studies show both matter
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