Twin Studies AO3

• -Mz twins look more similar so are more likely to be treated more similarly.
• +Twins are usually brought up in the same household at the same time so the environment is the same.
• +Mz twins have the same genes so it’s more obvious that ur one twin turns out criminal and the other doesn’t, that it’s the result of SLT and socialisation.
• -Christiansen’s study had a small sample meaning we can’t generalise. Mz twins share 100% DNA so statistically are more likely to both be criminals in comparison with dz twins 50%
• -Early twin studies weren’t carefully controlled by standardised procedures so lack scientific validity.