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

Answer 1

A substitution mutation occurs when one base pair in the DNA sequence is replaced by another base pair.

Let's analyze the given sequences for substitutions:

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

2. **Options:**
- Option 1:
- Sequence: C G T C T A C T G C A A T
- Original: C G T T A C T G C A A T
- Mutation: The second base 'T' is replaced with 'C' (substitution).

- Option 2:
- Sequence: C G T A C T G C A A T
- Original: C G T T A C T G C A A T
- Mutation: The fourth base 'T' is replaced with 'A' (substitution).

- Option 3:
- Sequence: C G T T A C T G C A A T
- Original: C G T T A C T G C A A T
- No mutation present.

- Option 4:
- Sequence: C G T G A C T G C A A T
- Original: C G T T A C T G C A A T
- Mutation: The 'T' is replaced with 'G' (substitution).

So we can see that both option 1 and option 4 show a substitution mutation.

**Correct Answers:**
- C G T C T A C T G C A A T
- C G T G A C T G C A A T

Please choose one based on your intended answer format. If only one option is to be selected, the first option (C G T C T A C T) is a correct choice for showing a substitution mutation.