To analyze the given DNA segment "CCC ATA GCT", we need to identify the changes caused by a deletion in the first codon triplet (which is "CCC") and then a substitution mutation.
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Original Segment: CCC ATA GCT
- Codon Triplets:
- 1st codon: CCC
- 2nd codon: ATA
- 3rd codon: GCT
- Codon Triplets:
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Deletion in the First Codon: If we delete one base from the first codon "CCC", it could result in "CC" or "C" if we're removing one ('C'). For mutations, let’s assume the deletion reduces it to "CC".
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Substitution Mutation: We can now substitute one base for another in the modified sequence. A common substitution could be replacing a base in the sequence. Let’s proceed with the deletion followed by a substitution.
Starting from the deletion:
- Deleting one 'C' from "CCC" gives us "CC A ATA GCT" (here I’m assuming one 'C' is removed).
Now let's look at the possible mutations, substituting one base after this deletion:
- If you substitute the first 'C' in "CC" with 'A', you can create "AC ATA GCT" - but let's check which responses have a logically sound path based on your input options.
The provided options do not reflect precisely one deletion and then a substitution; however, if we analyze the options:
- CCA TAA CT: Doesn't match.
- CCA TAG CT: Could potentially fit as a substitution after deletion, using the first "CC" as a base point.
- CCC TAG CT: This doesn't reflect a deletion, as it remains the same.
- CCA ATA GCT: This one shows an addition rather than a straightforward deletion-substitution.
Thus, if we're focusing on which of the given options can come from a deletion followed by a substitution, "CCA TAG CT" best represents a logical progression through a deletion (removing one base from CCC to form CC) and then a substitution in one of the resulting codons.
Final Answer: CCA TAG CT.
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