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twin & adoption studies - Coggle Diagram
twin & adoption studies
Twin study
1977 Christiansen
3500 sets of twins
denmark
MZ 52% both had a criminal conviction
DZ 22% both had a criminal conviction
summary
Genetic theory
dyzgotic twins 50%
crime runs in families e.g gambino
monozygotic twins 100%
medrick - adoption
christiansen - twins
follow up
2002 ishikawa and rain
MZ 44%
DZ 21.6%
twin murder in paris
Adoption study
shared genes vs enviroment
denmark
Medrick
14000 adopted sons
25 year period
20% criminal genes
14.7% criminal enviroment
follow up
1970 Crowe
50% criminal genes
5% criminal enviroment
evaluation
large sample
high validity
contributes to epigenetics debates
genes not sole factor
cant be studied in isolation from enviroment
reductionist approach
evaluation
gender bias
accounts other factors
large sample