To identify the correct copy of the DNA segment with a deletion in the first codon triplet and a substitution mutation, we first need to analyze the original sequence:
Original DNA segment: CCC ATA GCT
Let’s break it down:
- The first codon is CCC.
- The second codon is ATA.
- The third codon is GCT.
Step 1: Deletion in the first codon
After deleting the first codon (CCC), the remaining sequence would be:
- Remaining sequence after deletion: ATA GCT
Step 2: Substitution mutation
We will now look for a copy that has a substitution in the remaining sequence ATA GCT.
Analyzing the options:
- CCA TAG CT - deletion of CCC, substitution in ATA. (Not valid as it is not a direct substitution)
- CCA TAG CT - same as option 1 (Not valid)
- CCC TAG CT - does not exhibit deletion or substitution (Not valid)
- CCC TAG CT - same as option 3 (Not valid)
- CCA ATA GCT - deletion of the first codon CCC, no substitution (Not valid)
- CCA ATA GCT - same as option 5 (Not valid)
- CCA TAA CT - deletion of CCC, substitution A to T in A (Not valid)
From what we see from the options, it seems there could be an error based on the provided options, as none reflect both a deletion in the first codon and a substitution mutation exactly as requested.
However, based on the closest interpretation of what deletion and substitution might occur, if we assume the first codon has been deleted but the exact substitution has not been clearly represented, potentially options with CCA do show an altered sequence after the deletion of CCC.
If we consider a case where ATA could change to TAA potentially under mutations, then from the options, CCA TAA CT would be the closest depiction (albeit not a direct representation of original coding).
Given the requirements of the question, no exact answer fits tightly due to the lack of coherent responses addressing both the deletion and a substitution properly.
Please clarify if you need assistance with a different aspect of this mutation analysis.