What is the cause of a point mutation?

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(A) point mutation is a genetic mutation where a single nucleotide base is changed,inserted,or deleted from a $DNA$ or $RNA$ sequence of an organism's

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Addition,deletion,or substitution of a single base pair in a gene.

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(A) point mutation is a genetic mutation where a single nucleotide base is changed,inserted,or deleted from a $DNA$ or $RNA$ sequence of an organism's genome.Specifically,it involves the substitution,addition,or deletion of a single base pair in a gene.This can lead to changes in the amino acid sequence of the protein being synthesized,potentially affecting its function.Therefore,the correct option is $A$.

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