Q. Which one of the following is a wrong statement regarding mutations?
(a) Deletion and insertion of base pairs cause frameshift mutations.
(b) Cancer cells commonly show chromosomal aberrations.
(c) UV and gamma-rays are mutagens.
(d) Change in a single base pair of DNA does not cause mutation.
Solution :
Correct option : D Cancer cells commonly show chromosomal aberrations. Change in a single base pair of DNA cause mutations, which are called as point mutations. UV and γ-rays are mutagens, i.e., the mutation causing agents. Insertion or deletion of one or two bases changes the reading frame from the point of insertion or deletion. However, such mutations are referred to as frameshift insertion or deletion mutations. So, the statement in option D is wrong.
