A) temperature
B) X-rays
C) gamma and beta radiations
D) all of the above
Correct Answer: D
Solution :
Mutation is inheritable qualitative or quantitative change in the genetic material of an organism. The substances or agents which induce artificial mutation are called, mutagenic agents. (i) Radiations: These may be ionizing like X-rays gamma rays, alpha, beta, electrons, protons and other fast moving particles or non-ionising like UV and visible light. Ionising radiations cause break in poly-sugar phosphate back bone of DNA and thus causing chromosomal mutations such as break, deletion, addition, inversion and translocation. (ii) The UV radiation (non-ionising) produces several effects of DNA one being the formation of thymine dimer.
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