Answer:
The correct answer is - somatic cell division.
Explanation:
Genetic variation is the variation or difference in gene frequency or DNA in the population or among indiviuals. This difference generally caused by the mutation in genes such as deletion or duplication of a gene in the gene pool of an individual or population that can pass to the next generation.
Other than gene mutation, recombination, random mating or sexual reproduction (crossing over in meiosis) leads to genetic variation. The least likely or no genetic variation is caused by the asexual reproduction that takes place in somatic cell division or cells that are not taking part in sexual reproduction.
