Transversion seen in: (A) Guanine - cytosine, (B) Guanine - adenine, (C) Guanine - thymine, (D) Adenine - thymine
Answer is A. SubstitutionReplacement of a purine by another purine (A to G or G to A) or pyrimidine by pyrimidine(T to C or C to T) is called transition mutation. If purine is changed to a pyrimidine (A to C) or a pyrimidine to a purine(T to G), it is called a transversion mutation.Ref: Textbook of biochemistry ( DM Vasudevan), 6th edition, page no. 612