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 mutagents (for example tobacco)
-radiation (ionizing radiation) eg. x-rays and UVB (ultraviolet) rays (sunshine) can cause skin cancer.
-due to chemicals (tars in tobacco) cause mutation to base sequence producing new alleles and causes cancer.
-chemicals that cause mutations are called mutagens.
-mutagens which also causes cancer are called carcinogens.
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