twin studies

Question 1

strength: logical

Answer 1

MZ twins are genetically identical, it is logical to examine whether their offending behaviour is also identical

Question 2

strength: Christiansen

Answer 2

Christiansen (1977) supports the view that criminality does have a genetic component.

Question 3

weakness: unrepresentative

Answer 3

The small sample in twin studies may not be representative of the general population.

Question 4

weakness: isolation

Answer 4

In twin studies, it is impossible to isolate and measure the effect of genes separately from environmental effects.