NEET 2012 Biology question

Which one of the following is a wrong statement regarding mutations ?

(1)Change in a single base pair of DNA does not cause mutationCorrect
(2)Deletion and insertion of base pairs cause frame-shift mutations
(3)Cancer cells commonly show chromosomal aberrations
(4)UV and Gamma rays are mutagens

Answer: (1)

Solution

A mutation is a change in the DNA sequence. A change in even a single base pair (a point mutation) is a mutation; the best-known example is the substitution of one base (GAG to GUG) in the beta-globin gene, which causes sickle-cell anaemia. So statement (1) is wrong and is the answer. (2) is

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Question ID VK-091035