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 Biological approach with exam-style questions for A Level Psychology. 49 questions, 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.
