A mutation occurs in a section of non-coding DNA close to a gene.
After the mutation, the protein coded for by the gene still has the same sequence of amino acids. However, the cell now makes much less of the protein.
Which statement explains this?
The mutation changed the shape of the protein, so it was broken down faster.
The mutation changed the base sequence, so a different amino acid was added.
The mutation reduced transcription of the gene, so less mRNA was produced.
The mutation removed the gene from the chromosome, so no protein could form.
186 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.