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Codons and mutations

Problem

Below are two sequences of a segment of DNA.
Normal sequence  TGA CAC TAG Mutated sequence  TGA CCT AG \begin{aligned}\text{Normal sequence }&\text{ TGA CAC TAG } \\\\ \text{Mutated sequence }&\text{ TGA CCT AG }\end{aligned}
Which type of mutation has occurred?
Choose 1 answer:
Choose 1 answer:
Stuck?
Stuck?