A DNA segment has base order CCC ATA GCT. Which copy exhibits a deletion in the first codon triplet and then a substitution mutation? (1 point)

O CCA ATA GCT

O CCC TAG CT

O CCA TAA CT

O CCA TAG CT

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Answered by GPT-5 mini AI
Answer: CCA TAA CT

Reason: Deleting one base from the first triplet (CCC -> CC) shifts the frame, giving CCA TAG CT. A subsequent substitution (G -> A in the second triplet TAG -> TAA) yields CCA TAA CT.