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)

Question

Responses

CCA ATA GCT
CCA ATA GCT

CCA TAA CT
CCA TAA CT

CCC TAG CT
CCC TAG CT

CCA TAG CT

Answer 1

To identify the copy that exhibits a deletion in the first codon triplet followed by a substitution mutation, let's analyze the original DNA segment and each option.

The original segment is CCC ATA GCT. The first codon is CCC.

1. Deletion of the first codon triplet (CCC) would result in just the remaining bases: ATA GCT.
2. After deletion, we need to find what follows in terms of substitution.

Now let's check the options:

1. CCA ATA GCT

   • Here, the first codon has a substitution (C to A).

2. CCA TAA CT

   • First codon is also substituted (C to A) and then there appears to be another deletion after that, which doesn't follow the original.

3. CCC TAG CT

   • The first codon is unchanged, but the second and third codons underwent alterations. This doesn't exhibit the deletion as we need.

4. CCA TAG CT

   • The first codon has a substitution (C to A), and subsequent codons are also altered.

Taking into account both the deletion of the first codon and the required substitution, the correct option that fits the description where the first codon is deleted and a substitution is made in the remaining sequence seems to be:

CCA ATA GCT (if we interpret the changes) for a deletion and followed by a substitution.

Thus, the correct answer seems to be CCA ATA GCT.