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A DNA segment has base order AGC TTA TCG. Which copy exhibits a frameshift mutation through deletion?

• TTA TCG


• AGC TIT CG

AGC TCG



• AGC TTA TAG

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Answered by GPT-5 mini AI
The second choice (the one shown as "AGC TIT CG" — i.e. AGC TTT CG after the deletion) exhibits a frameshift. Deleting a single base shifts the triplet reading frame (AGC | TTA | TCG → AGC | TTT | CG…), whereas the other deletions remove whole codons (multiples of 3) or are point changes.