20.1 Gene expression
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6 Terms
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Mutation
Any change to the quantity or the structure of the DNA of an organism is a mutation.
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Substitution of bases:
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Deletion of bases
Frame shift - one deleted base creates what is known as a frameshift because the reading fram that contains each three letters of the code has been shifted to the left by one letter.
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Other types of gene mutation
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Causes of mutations (bullet points)
High energy ionising radiation
Chemicals
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Causes of mutations - continued
Note 
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