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Biological Causes of offending behaviour - Coggle Diagram
Biological Causes of offending behaviour
MAOA
"warrior gene" is a protein, the gene responsible for low MAOA is accosiated with aggression MAOA regulates the metabolism of seratonin
Serotonin
controls impulse behaviours
DZ/MZ TWINS
DZ Twins share 50% of their DNA
MZ Twins share 100% of their DNA
Raine 1993
Found a 52% concordance rate for deliquent behaviour for MZ twins compared to 21% for DZ twins
Cadherin13
Finnish study that shows evidence of low MAOA and low activity from the CDH13 gene in Violent crime
Caspi2002
Studied 1000 Male children and found that low levels of MAOA were associated with anti social behaviour but only but only if mistreated as children.
If they had high levels of MAOA and not maltreated there was no antisocial behaviour
Epigenetics
an interplay where genes are "switched" on or off by epigenomes which in turn have been affected by enviromental factors
Tilhonen
Conducted a study with 900 offenders and estimates 5-10% of all violent crime is due to an abnormality in the two genes
Brunner 1993
Analysed the DNA of male members of a DUTCH FAMILY who had histories of violent criminal behaviour. He found they had low levels of MAOA and a defect in the Gene