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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

1 answer

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