Monday, 10 October 2011

3.34 Causes of Mutation

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. (e.g. ACT => AAT)


Causes:
Radation - Xrays or sunshine (UVB) in this case of UVB this can cause a mutation which leads to skin cancer
Chemicals - effects of tars and tobacco which causes a change in the base sequence which can also lead to cancer.


Chemicals which cause mutation are called mutagens and those that cause cancers are called carcinogen.

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