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  4. If the DNA codons are ATG ATG ATG and a cytosine base is inserted at the beginning, then j which of the following will result?

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Q. If the DNA codons are ATG ATG ATG and a cytosine base is inserted at the beginning, then j which of the following will result?

AIPMTAIPMT 1995Molecular Basis of Inheritance

Solution:

Nonsense mutation is a mutation which interconverts a nonsense to or from a sense-coding triplet, resulting in an abnormally foreshortened or elongated polypeptide chain. But in this example cytosine is added at the beginning so CAT GAT GATG will result.