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5 June, 13:31

Mutations in DNA are usually caused by chemical or radiation damage to DNA molecules, followed by imperfect repair of the damage. Immediately after this kind of imperfect repair, there may be a mismatched base pair in the DNA. The illustration below shows an example of a mismatch, with the relevant pair bases in bold.

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  1. 5 June, 14:30
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    This question is incomplete

    Explanation:

    Where this question is correct in the statement it provides, it does not provide the illustration to provide an example.

    Genetic mutations in DNA are caused by chemical damage (particles that can alter the structure of DNA, or change the bonding of the base pairs) and radiation damage (UV radiation is known to cause mutations known as thymine dimers. These mutations are two thymine molecules on the same strand pairing together to alter the structure of the DNA molecule. This can also be written as T=T).

    A thymine dimer is an example of mismatched base pairs. The correct pairing is Adenine with Thymine, and Cytosine with Guanine.
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