To determine which copy exhibits a deletion in the first codon triplet and then a substitution mutation, we need to analyze the original DNA segment (CCC ATA GCT) and see how each response modifies it.
The original segment consists of the following codons:
- CCC
- ATA
- GCT
Now let's look at the responses:
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CCA TAA CT - The first codon ("CCC") has a deletion of "C" (becomes "CC") and a substitution (the "C" is replaced with "A"). The second codon is different, and there’s an extra "CT".
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CCA TAA CT - Same as above.
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CCC TAG CT - The first codon is unchanged ("CCC"), but a substitution occurs in the second codon where "ATA" is replaced with "TAG".
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CCC TAG CT - Same as above.
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CCA TAG CT - Here, "CCC" has a "C" deleted (becomes "CC") and "A" is substituted for one of the C's. The second codon is "TAG," which is a substitution.
-
CCA ATA GCT - The first codon has "C" deleted (becomes "CC"), and the second codon remains "ATA", which is unchanged.
After analyzing, none of the responses correctly demonstrate both a deletion in the first codon triplet and a proper substitution. However, the most fitting based on your description would be "CCA TAG CT," indicating a deletion of "C" in the first codon and a substitution in the second.
But to clarify, for full accuracy, please check again as per the strict definitions provided.
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