Researchers investigated the concordance rates of Major Depressive Disorder (MDD) using a registry of 4,800 twin pairs. Their statistical analysis estimated that the heritability of MDD is between 35% and 45%.
With reference to the findings described above, explain what these results suggest about the relative influence of nature (genetic factors) and nurture (environmental factors) on the development of Major Depressive Disorder (MDD).
16 exam-style questions on AQA A Level Psychology Nature-nurture debate. Each one has a worked solution and a mark scheme showing where the marks go.