Biological Theories Of Criminality Flashcards
Who did Mednick et al conduct research on for adoptions studies?
14,000 adopted sons in Denmark.
What did mednick et al find?
A 20% concordance rate if birth parent had criminal record. 14.7% concordance rate if adoptive parent had criminal record.
What did Hutchings and mednick find regarding adoption studies?
Adoptees are more likely to have a criminal record if their parents do.
What did Ishikawa and raine find for twin studies?
A 44% concordance rate for MZ twins. A 21.6% concordance rate for DZ twins.
How may twin pairs did Christiansen study in Denmark?
3586.
What did Christiansen find?
A 52% concordance rate in MZ twins. A 22% concordance rate in DZ twins.
What is the Cambridge study in delinquent development and what did it find?
A longitudinal study running since 1961 that’s found out of 397 families 1/2 of all criminal convictions came from 32 families.
What did Osborn and west state?
Sons of criminal fathers are much more likely to have a criminal record too.
What traits are associated with XYY syndrome?
Explosive tempers, hyperactivity, defiance and anti-social behaviour.
What did price and what more say about Jacob’s XYY syndrome?
they are immature and unstable and commit seemingly motiveless property crimes.
