... were two monozygotic children have been brought up apart. If both children turn out to be criminals then it supports the genetic explanation. The average concordance rate has been 55%. Mednick (1987) and Bohman (1995) looked at court convictions and criminal records of 14,000 people and their biological and adoptive parents. They found many of the criminals had criminal parents and there was a strong relationship between fathers and sons. Although when social conditions improved there was a decrease in crime. Osborne and West (1979) found that 40% of sons with criminal fathers became criminals compared with 13% of sons with non-criminal fathers. Farrington (1991) found that delinquency is linked with parent criminality, poor child rearing techniques, large families and low income. Jacobs et al suggested men with the XYY syndrome were more aggressive than normal XY men and are over represented in prisons. This showing that they may not ...

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