Answer:
when the mice are exposed to tobacco smoke and ultraviolet radiation, mutation will occur.
Explanation:
Mutation refers to the sudden change which occurs in the genetic makeup of an organisms. There are various agents which are responsible for mutation but in this experiment only two are used such as tobacco smoke and ultraviolet radiation. When the mice is exposed to tobacco smoke, mutation occurs due to the formation of abnormal cells which causes cancer because tobacco smoke contains cancer causing agents while when the mice are exposed ultraviolet radiation, mutation will occur by causing damage to the DNA of mice and cause of producing abnormal cells. But in normal condition, mutation will not occur.