With reference to relevant research studies, to what extent does genetic inheritance influence behaviour? (22)

To What Extent (22) – Consider the merits or otherwise of an argument or concept. Opinions and conclusions should be presented clearly and supported with appropriate evidence and sound argument.

Genetics on behaviour

Correlational study

Strengths of correlation studies

Weaknesses of correlation studies

Procedures of correlational genetic studies

Twin studies

Family studies

Genetics studies grid
Researcher Research for # of pairs Subjects Concordance rate
Price Bipolar depression 97 MZ twins Reared together 68%
Reared apart 67%
119 DZ twins 23%
Allen Unipolar depression - MZ twins 40%
- DZ twins 11%
Bertelsen, Harvald and Hauge Unipolar depression - MZ twins 80%
- DZ twins 16%
McGuffin et al. Unipolar depression 117 MZ twins 40%
DZ twins 20%
Gershon Unipolar depression - First degree relative
  • Individuals with a first degree relative with depression was about two to three times higher than in the general population.
  • Social learning theory might be a possible explanation.
Wender Unipolar depression - Adopted children Adopted children who went on to develop depression had biological parents that were eight times more likely to have depression than their adoptive parents.