Question

homework - mutations
a dna base sequence that has undergone an addition mutation reads: tatccgacgc. what original dna base sequence is possible?
ataggctgcg
tatccgaacgc
tatccgactc
tatcgacgc

Explanation:

An addition mutation adds a base. So, the original sequence should be one base shorter than the mutated sequence. The mutated sequence is TATCCGACGC (10 bases). Let's check each option:

• ATAGGCTGCG: Different sequence pattern, not just one - base shorter.
• TATCCGAACGC: 11 bases (more than mutated sequence).
• TATCCGACTC: 10 bases (same as mutated).
• TATCGACGC: 9 bases (one - base shorter than TATCCGACGC).

Answer:

TATCGACGC