46, XX/46,XY

46,XX/46,XY is a chimeric genetic condition 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 sometimes associated with Intersex conditions such as ambiguous genitalia and hermaphroditism, but in many cases phenotypically normal male or female development occurs. 46,XX/46,XY is a chimeric genetic condition 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 sometimes associated with Intersex conditions such as ambiguous genitalia and hermaphroditism, but in many cases phenotypically normal male or female development occurs. 46,XX/46,XY chimerism can be identified during pregnancy by prenatal screening or in early childhood through genetic testing and direct observation.