What causes gene mutation?

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(C) Gene mutation is defined as a permanent alteration in the $DNA$ sequence that makes up a gene. This change occurs due to a change in the sequence

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Change in the sequence of $N_2$ bases

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(C) Gene mutation is defined as a permanent alteration in the $DNA$ sequence that makes up a gene. This change occurs due to a change in the sequence of nitrogenous $(N_2)$ bases (adenine,guanine,cytosine,and thymine) within the $DNA$ molecule. Such alterations can lead to changes in the amino acid sequence of the resulting protein,potentially affecting its function.

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