A point mutation comprising substitution of purine with pyrimidine is (a) Transition (b) Transversion (c) Deletion (d) Translocation
Substitution of purine base for a pyrimidine base or substitution of pyrimidine base for a purine base is called as transversion. Hence, adenine is replaced with thymine/ uracil and guanine with cytosine which makes option B correct.
