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It has been suggested that this article or section be merged with [[::Gene duplication|Gene duplication]]. (Discuss)

A duplication

Chromosomal duplication occurs when a section of DNA is accidentally duplicated when a chromosome is copied. A duplication may occur as the result unequal crossing over, the mispairing and exchange of DNA between genetically similar, nonhomologous chromosome regions that results in duplication of DNA in each daughter cell.

Bloom and Rett syndrome are caused by chromosomal duplications.

See also