Question

Look at the DNA sequence.

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

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
Table with 12 columns and 2 rows.Row 1: Column 1, 'C'; Column 2, 'G'; Column 3, 'T'; Column 4, 'T'; Column 5, 'A'; Column 6, 'C'; Column 7, 'T'; Column 8, 'G'; Column 9, 'C'; Column 10, 'A'; Column 11, 'A'; Column 12, 'T' Row 2: Column 1, 'G'; Column 2, 'C'; Column 3, 'A'; Column 4, 'A'; Column 5, 'T'; Column 6, 'G'; Column 7, 'A'; Column 8, 'C'; Column 9, 'G'; Column 10, 'T'; Column 11, 'T'; Column 12, 'A'

DNA Sequence
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
Table with 13 columns and 2 rows.Row 1: Column 1, 'C'; Column 2, 'G'; Column 3, 'T'; Column 4, 'C'; Column 5, 'T'; Column 6, 'A'; Column 7, 'C'; Column 8, 'T'; Column 9, 'G'; Column 10, 'C'; Column 11, 'A'; Column 12, 'A'; Column 13, 'T' Row 2: Column 1, 'G'; Column 2, 'C'; Column 3, 'A'; Column 4, 'G'; Column 5, 'A'; Column 6, 'T'; Column 7, 'G'; Column 8, 'A'; Column 9, 'C'; Column 10, 'G'; Column 11, 'T'; Column 12, 'T'; Column 13, 'A'

DNA Sequence
C G T A C T G C A A T
G C A T G A C G T T A
Table with 11 columns and 2 rows.Row 1: Column 1, 'C'; Column 2, 'G'; Column 3, 'T'; Column 4, 'A'; Column 5, 'C'; Column 6, 'T'; Column 7, 'G'; Column 8, 'C'; Column 9, 'A'; Column 10, 'A'; Column 11, 'T' Row 2: Column 1, 'G'; Column 2, 'C'; Column 3, 'A'; Column 4, 'T'; Column 5, 'G'; Column 6, 'A'; Column 7, 'C'; Column 8, 'G'; Column 9, 'T'; Column 10, 'T'; Column 11, 'A'

DNA Sequence
C G T G A C T G C A A T
G C A C T G A C G T T A
Table with 12 columns and 2 rows.Row 1: Column 1, 'C'; Column 2, 'G'; Column 3, 'T'; Column 4, 'G'; Column 5, 'A'; Column 6, 'C'; Column 7, 'T'; Column 8, 'G'; Column 9, 'C'; Column 10, 'A'; Column 11, 'A'; Column 12, 'T' Row 2: Column 1, 'G'; Column 2, 'C'; Column 3, 'A'; Column 4, 'C'; Column 5, 'T'; Column 6, 'G'; Column 7, 'A'; Column 8, 'C'; Column 9, 'G'; Column 10, 'T'; Column 11, 'T'; Column 12, 'A'
Skip to navigation

Answer 1

The fourth sequence (Top: C G T G A C T G C A A T; Bottom: G C A C T G A C G T T A).

Reason: length is unchanged but one base pair is different (position 4: T → G), so it’s a single-base substitution.