A researcher conducts a study on identical twins who were raised in the same household to investigate the genetic basis of intelligence.
Explain one limitation of using this study to support the biological approach.
248 exam-style questions on AQA A Level Psychology Approaches in Psychology, covering Learning approaches, Cognitive approach, Biological approach, Psychodynamic approach (A-level only), Humanistic Psychology (A-level only), and Comparison of approaches (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.