Question

Normally DNA molecule has A-T, G-C pairing. However, these bases can exist in alternative valency status owing to rearrangements called

• A. Frameshift mutation
• B. Tautomerisational mutation
• C. Analog substitution
• D. Point mutation

Answer 1

The correct option is B Tautomerisational mutation

Normally DNA molecule has A-T, G-C pairing. In this, adenine is complementary to the thymine base and guanine is complementary to the cytosine base. However, these bases can exist in alternative valency status owing to rearrangements called tautomerisational mutation. Due to copy error, these bases exist in tautomer states. However, this status is not stable during next replication and tautomeric returns to normal state. Frame-shift mutation is produced by deletion or addition of base. Point mutation is the mutation in a genes due to a change in a single base pair.

Thus, the correct answer is 'Tautomerisational mutation.'