A certain genetic mutation causes a person's body to produce a non-functional enzyme, leading to a buildup of a harmful chemical in the blood. A new drug is developed that successfully neutralizes this chemical, preventing all symptoms. What effect would this drug treatment have on the person's phenotype and genotype?
Changes both the phenotype and genotype.
Changes the genotype only.
Changes the phenotype only.
No change to their phenotype or genotype.
97 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.