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genetics please explain in paragraph

Mitotic recombination has been implicated as an important factor inherited forms of cancer such as retinoblastoma. Why?
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Miyotic recombination is a type of genetic recombination that may occure in somatic cells during their preparation for mitosis. It can result in expression of recessive genes in an otherwise heterozygous individual. It occurs mainly between sister chromatids subsequent to replication. Inter-sister homologous recombination is ordinarily genetically silent. During mitosis the incidence of recombination between non-sister homologous chromatids is only about 1% of that between sister chromatids.

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