Question

Genetic Variation from Errors Quick Check 2 of 52 of 5 Items Question 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) Responses CCA TAA CT CCA TAA CT CCC TAG CT CCC TAG CT CCA TAG CT CCA TAG CT CCA ATA GCT CCA ATA GCT Skip to navigation page 12 of 12

Answer 1

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:
1. CCC
2. ATA
3. GCT

Now let's look at the responses:

1. **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".

2. **CCA TAA CT** - Same as above.

3. **CCC TAG CT** - The first codon is unchanged ("CCC"), but a substitution occurs in the second codon where "ATA" is replaced with "TAG".

4. **CCC TAG CT** - Same as above.

5. **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.

6. **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.