The ultimate source of organic evolution is:

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(A) Organic evolution refers to the changes in the genetic composition of a population over time. Mutation is defined as a sudden,heritable change in

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Mutation

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(A) Organic evolution refers to the changes in the genetic composition of a population over time. Mutation is defined as a sudden,heritable change in the $DNA$ sequence. Mutations are considered the ultimate source of all genetic variation because they introduce new alleles into the gene pool that were not previously present. While sexual reproduction and natural selection act upon these variations to shape the evolutionary process,mutation provides the raw material upon which these forces work. Therefore,mutation is the ultimate source of organic evolution.

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