3.34 Causes of Mutation

1. A mutation is a change in the base sequence in the gene. 
2. Mutations could be caused by ionising radiations such as x-rays. 
3. It could be caused by sunshine- ultraviolet rays- skin cancer 
4. mutations could be caused by chemicals such as tars and tabacco- causes cancer
5. They cause mutation within the base sequence 
6. Chemicals which cause mutations are called mutigens, they also cause cancer.