If the DNA codons are ATG ATG ATG and a cytosine base is inserted in the beginning, which of the following will result?
Correct answer: A. CAT GAT GATG
- A. CAT GAT GATG
- B. A nonsense mutation
- C. ATG ATG ATG
- D. CA TGA TGA TG
Explanation
A nonsense mutation is a mutation which interconverts a nonsense codon to or from a sense-coding triplet, resulting in an abnormally shortened or elongated polypeptide chain. But in this example, cytosine is added at the beginning, so CAT GAT GATG will result.
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