What is the cause of mutation?

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(D) Mutation is defined as a sudden,heritable change in the genetic material of an organism.It can occur due to various factors:$1$. Changes in $DNA$

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(D) Mutation is defined as a sudden,heritable change in the genetic material of an organism.It can occur due to various factors:$1$. Changes in $DNA$ sequences (point mutations or frame-shift mutations).$2$. Changes in the structure or number of chromosomes (chromosomal aberrations).$3$. Changes in specific genes which alter the phenotype.Therefore,all the listed factors contribute to the phenomenon of mutation.

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