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A DNA segment has base order CCC ATA GCT. Which copy exhibits a deletion in the first codon triplet and then a substitution mutation?
• CCA TAG CT
• CCA ATA GCT
• CCC TAG CT
• CCA TAA CT
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CCA TAA CT
Explanation: Deleting one base from the first codon (CCC → remove one C) gives a frameshift: CCC ATA GCT → CCA TAG CT. A subsequent substitution changing the G to A in the second codon yields CCA TAA CT.
Explanation: Deleting one base from the first codon (CCC → remove one C) gives a frameshift: CCC ATA GCT → CCA TAG CT. A subsequent substitution changing the G to A in the second codon yields CCA TAA CT.
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