Question

Look at the DNA sequence.

C G T T A C T G C A A T
G C A A T G A C G T T A
Which sequence shows a substitution mutation?

(1 point)
Responses

C G T A C T G C A A T
G C A T G A C G T T AC G T A C T G C A A T G C A T G A C G T T A

C G T T A C T G C A A T
G C A A T G A C G T T AC G T T A C T G C A A T G C A A T G A C G T T A

C G T C T A C T G C A A T
G C A G A T G A C G T T AC G T C T A C T G C A A T G C A G A T G A C G T T A

C G T G A C T G C A A T
G C A C T G A C G T T AC G T G A C T G C A A T G C A C T G A C G T T A
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Answer 1

A substitution mutation occurs when one nucleotide is replaced by another in a DNA sequence.

To identify which sequence shows a substitution mutation, we can compare the provided sequences with the original DNA sequences you provided:

**Original Sequences:**
1. C G T T A C T G C A A T
2. G C A A T G A C G T T A

Let's analyze the provided options:

1. **C G T A C T G C A A T**
The first nucleotide 'G' is replaced by 'A', which is a substitution mutation.

2. **C G T T A C T G C A A T**
This is identical to the original sequence, so no mutation here.

3. **C G T C T A C T G C A A T**
The third nucleotide 'T' is replaced by 'C', which is a substitution mutation.

4. **C G T G A C T G C A A T**
The fourth nucleotide 'T' is replaced by 'G', which is a substitution mutation.

Based on the analysis, the correct answers are:
- C G T A C T G C A A T (substitution)
- C G T C T A C T G C A A T (substitution)
- C G T G A C T G C A A T (substitution)

However, since the question requires only one response, the first option is a substitution mutation.

If we collect a response from the first option, then:

**Response:** C G T A C T G C A A T