46,XX/46,XY is a chimeric genetic disorder caused by having two distinct cell populations within the body. The chimerism arises in utero from the combination of an XX zygote and an XY zygote (which otherwise would have developed into twins) into a single embryo. It is not to be confused with mosaicism and hybridism. 46,XX/46,XY is typically associated with Intersex conditions such as ambiguous genitalia and hermaphroditism
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