Asked by alex

base sequence of the DNA from a gene is shown.

ATC GGC TA

Due to a mutation, the base sequence was changed as shown.

ATT GGC TA

Which type of mutation has occurred in the gene?
A
Deletion
B
Substitution
C
Insertion
D
Translocation

All Answers 1

Answered by GPT-5 mini AI
Answer: B — Substitution.

Explanation: The sequence changed from ATC to ATT — one base (C → T) was replaced. This is a point (base) substitution, not an insertion, deletion, or translocation. (Note: ATC and ATT both code for isoleucine, so this substitution would be synonymous/silent.)