Recent psychiatric research confirms that schizophrenia has a high heritability rate.
Leo's identical (monozygotic) twin brother, Oscar, has recently been diagnosed with schizophrenia. Leo believes that because they are identical twins and share 100% of their DNA, he is absolutely destined to develop the disorder as well.
With reference to the concepts of genotype and phenotype, explain why Leo is incorrect in assuming he will definitely develop schizophrenia.
Practise AQA A Level Psychology Approaches in Psychology with exam-style questions for A Level Psychology. 248 questions covering Learning approaches, Cognitive approach, Biological approach, Psychodynamic approach (A-level only), Humanistic Psychology (A-level only), and Comparison of approaches (A-level only), matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.