Twin & Adoption Studies

Question 1

Twin study eval.

Answer 1

Pros
Investigates the influence of genetics, assumed environment is the same
Often large sample as taken from twin registries (QNTS for Brendgen)

Cons
Cannot identify the genes involved in the behaviour

Question 2

Adoption study eval.

Answer 2

Pros
Removing extraneous variable of similar environment causing traits

Cons
Children may be adopted by families similar to their original one e.g. well educated. This means environment can play an impact on findings
People who adopt often come from good socioeconomic backgrounds, extraneous variable