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Genetics and neural explanations for crime - Coggle Diagram
Genetics and neural explanations for crime
MAOA gene:
"warrior gene"
MAOA is a protein, the gene responsible for low MAOA is associated with aggression
MAOA regulates the metabolism of low serotoin
Brunner analysed the DNA of male members of a Dutch family (1980) who had histories of iolent criminal behaviour. He found that they had low levels of MAOA and a defect in the gene
A Finnish study found evidence of low MAOA and low activity from the CDH13 gene in violent crime
Capsi studied 1000 male children and found that low levels of MAOA were associated with antisocial behaviour but only if they were mistreated as children. If they had high levels of MAOA and were mistreated or had low levels of MAOA and were not mistreated, there was no antisocial behaviour
Twin studies:
M/Z
Share 100% of DNA
D/Z
share 50% of DNA
Raine found a 52% concordance rate for delinquent behaviour for M/Z twins compared to 21% for D/Z twins for delinquent behaviour
Epigenetics:
An interplay where genes are "switched" on or off by epigenomes which in tuen have been affected by environmetal factors
Diathesis stress model:
Genes may predispose an individual to aggression (genotype) but an environmental trigger is needed for aggression to be expressed (phenotype)
Tilhonen:
conducted a study in finalnd with 900 offenders and estimated that 5-10% of all violent crime in finlad is due to abnormalities in one of two genes
ALL OF THIS CAN ONLY EXPLAIN VIOLENT CRIMINAL BEHAVIOUR! IT WILL NOT EXPLAIN NONVIOLENT CRIMES SUCH AS THEFT