Mutation
Gene (ACT) ---- mutation changes base sequence ----> New allele (AAT)
Causes
1. Ionising Radiation
-> X-rays / gamma rays
-> Ultraviolet: UV-B rays (sunshine) -> mutations such as skin cancer
2. Chemicals (mutagens = chemicals which cause mutations)
-> Tars (tobacco) -> cancerous conditions
* mutagens which also cause cancer = carcinogens
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