Question

In a mutational event, when adenine is replaced by guanine, it is a case of

• A. Transcription
• B. Transition
• C. Transversion
• D. Frameshift mutation

Answer 1

The correct option is B Transition

A transition mutation is a point mutation that changes a purine nucleotide to another purine (A ↔ G) or a pyrimidine nucleotide to another pyrimidine (C ↔ T).
There is no such thing as a transcription mutation. A transversion mutation is one where a purine nucleotide is changed into a pyrimidine nucleotide or vice versa (A or G ↔ T or C). A frameshift mutation is a mutation caused by the addition or deletion of a base pair or base pairs in the DNA of a gene.