Question

In gene mutation, adenine is replaced by guanine. It is known as

• A. Substitution
• B. Point mutation
• C. Transition
• D. Transversion

Answer 1

The correct option is C Transition

In case of transition, purine base is replaced by another purine base

e.g. A⇌G (A=adenine, G=guanine) and pyrimidine are replaced by another pyrimidine e.g., C⇌T (C=cytosine, T=thymine) and vice-versa.

In the case of transversion, purine is replaced by a pyrimidine and vice-versa.

So, the correct answer is 'Transition'.