A mutation changes one nucleotide but the amino acid sequence of the protein stays the same. What type of mutation is this?
Answer and explanation
Correct answer: B. A silent mutation
- Step 1: The genetic code is redundant, so several codons code for one amino acid. Step 2. A change that gives a synonymous codon has no effect on the protein. Answer: a silent mutation. Why not the others: Missense mutations change a codon to code for a different amino acid; nonsense mutations introduce premature stop codons; and frameshift mutations alter the reading frame downstream of an insertion or deletion.
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