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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 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 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 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
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1 answer

To identify which sequence shows a substitution mutation, we need to look for differences in the DNA sequences that proceed from an original sequence to a mutated sequence.

Given DNA sequences:

  1. Original:

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

  2. Options:

    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

    B.

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

    C.

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

    D.

    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

Analysis:

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

Option A: No change; this is the original sequence.

Option B: In the first line, "T" changes to "A" (substituted). In the second line, "A" is replaced with "T". This shows a substitution in both sequences.

Option C: In the first line, "T" changes to "G" and "C" to "A" in the second line. This represents substitutions.

Option D: In the first line, "T" is replaced by "C" and "G" is replaced by "A" in the second line. This also shows substitutions.

In conclusion, multiple options show substitution mutations.

Correct Response: Option B for clear substitutions happening in both sequences.