tetragametic chimerism https://www.malacards.org/card/tetragametic_chimerism MONDO:0016045 MEDGEN:609542 UMLS:C0432480 46,XX/46,XY chimerism Tetragametic chimerism is a rare, sex chromosome disorder of sex development characterized by the two different haploid sets of maternal and paternal chromosomes and variable phenotype - from normal male or female genitalia, to different degrees of ambiguous genitalia, and often infertility. Also, in the cases of monochorionic dizygotic twins, it can be confined to blood of both twins. Orphanet:199310 GARD:0020332 sex chromosome disorder of sex development