Mutations are caused due to

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(D) mutation is defined as a sudden,heritable change in the genetic material of an organism. At the molecular level,a mutation is caused by a change i

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Change in base sequence

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(D) mutation is defined as a sudden,heritable change in the genetic material of an organism. At the molecular level,a mutation is caused by a change in the base sequence of $DNA$. While radioactive substances,chemicals,and radiations act as 'mutagens' (agents that induce mutations),the fundamental biological event that constitutes a mutation is the alteration of the nucleotide base sequence.

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