CC210 Lecture Notes - Neuroticism, Cerebral Cortex, Extraversion And Introversion
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Psychology of Crime
September 26th, 2012
Week 3, Wednesday
Role of genetics on crime:
•criminality was inherited
•resemble primate in appearance and behaviour
•Born criminal had physical defects
•as well as in the way the walk, looked and behaved.
Sloping and protruding foreheads, unusual ear size, lower jaw is protruding from the face, symmetry is
not present between left and right sides, longer arms. Lombroso was the first to say that criminality is a
Estimating Influence of Heritability
family studies, twin studies and adoption studies.
Juke family study:
By richard L dugdale:
An investigation of the hereditary line of a family in New York (709 family members)
60 habitual thieves, 7 murderers, 50 prostitutes.
Concluded genetics, shared environment played role.
Problem with the study: not all the 709 family members were related by blood. They were married in
Dizygotic Twins: fraternal- two different eggs, only case where you can have a girl and boy.
Genetically as different as non-twin siblings.
Monozygotic: Identical twins
Same egg- split it two. Share same genes, DNA.
Degree to which related pairs of subjects demonstrate a particular behaviour or condition.
•What's the percent of twins that both engage in crime, or both do not engage in crime.
Monozygotic vs. Dizygotic:
If genes influence crime, identical twins should have a higer concordance rate for having a criminal
history that fraternal twins.
B/C MZ twins share more genetic make-up.
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