Understand that the incidence of mutations can be increased by exposure to ionizing radiation (for example gamma rays, X-rays and ultraviolet rays) and some chemical mutagens (for example chemicals in tobacco).
Mutation is the change in base sequence of the genes, which creates new alleles.
Cases for mutation
1. Radiation such as X-Ray, UV-B ray (sunshine) that can cause diseases such as cancer
2. Chemicals… effect of tars and tobacco, which cause the change in base sequence that can lead to cancer. Chemicals which caused mutation are called mutagens and those that also cause cancer are called carcinogen.
some images would have helped but the text is accurate and complete
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