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

Answer 1

To identify a substitution mutation in the provided sequences, we should compare each sequence to the original DNA sequence:

Original 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

Now, let's analyze the provided sequences:

1. **C G T T A C T G C A A T G C A A T G A C G T T A**
(No mutation, this matches the original sequence.)

2. **C G T T A C T G C A A T G C A A T G A C G T T A**
(No mutation, this matches the original sequence.)

3. **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**
(Substitution mutation: **G** is substituted with **C** in position 3.)

4. **C G T T A C T G C A A T G C A G A T G A C G T T A**
(Substitution mutation: **G** is substituted with **C** in position 3, which is the same as sequence 3.)

5. **C G T G A C T G C A A T G C A C T G A C G T T A**
(Substitution mutation: **T** is substituted with **G** in position 3.)

6. **C G T A C T G C A A T G C A T G A C G T T A**
(Substitution mutation: **T** is replaced with **A** in position 3.)

From the above sequences, the sequence with a substitution mutation is sequences 3, 4, and 5. Specifically, sequence 3 ("C G T C T A C T ...") has a clear substitution mutation in the third position when compared to the original sequence.

So the answer would be:

**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**