Magana: Triple X syndrome ba a gada ba, amma yawanci yakan faru ne a yayin da ake samar da kwayoyin halitta (kwai da maniyyi). Kuskuren rarraba kwayar halitta da ake kira nondisjunction na iya haifar da kwayoyin halitta tare da ƙarin chromosomes. Alal misali, kwayar halitta ko kwayar zuma na iya samun ƙarin kwafin X chromosome sakamakon rashin rarrabuwa. Idan ɗayan waɗannan ƙwayoyin suna ba da gudummawa ga ƙirar kwayoyin halitta na yaro, yaron zai sami ƙarin X chromosome a kowane ɗayan sel. A wasu lokuta, trisomy X yana faruwa a lokacin rarraba kwayar halitta a farkon ci gaban tayin. Tambaya: Menene ake kira kuskuren tantanin halitta a cikin rabuwa?
rashin daidaituwa