The Genetic Explanation

Question 1

Name one family study and it’s findings.

Answer 1

Kendler et al (1985), found 18x greater risk of schizophrenia if 1* relative was schizophrenic.

Question 2

Name one adoption study and it’s findings.

Answer 2

Tienari et al (1987), 112 adopted children who had biological mother with schizophrenia, 135 adopted without.
7% of children developed schizophrenia compared to 1.5% in control group.

Question 3

Name one twin study and the findings.

Answer 3

Torey (1992), in systematic review, found 26% concordance rate in MZ, and 6% in DZ.

Question 4

Give two strengths of the genetic explanation.

Answer 4

The results of Kendler et al (1985).

Reductionist, so can establish a clear link/relationship.

Question 5

Give 2 weaknesses of the genetic explanation.

Answer 5

Torey’s study shows that explanation lacks validity as MZ twins share 100% DNA but only have concordance rate of 26%.

Genetics can only establish links to schizophrenia. No clear cause and effect.