尽管家族性易位和配子嵌合有导致21三体复发的可能,但迄今除母亲年龄外,任何因素对Down综合征(21三体)的影响都没得出一致性结论。Down综合征病因学的研究多数学者把注意力集中在母亲受照射方 Although familial translocation and gamete chimerism have the potential to lead to the trisomy 21 relapse, none of the factors that have affected the Down syndrome (trisomy 21) to date, except for maternal age, have been conclusively drawn. Down Syndrome Etiology Most scholars focus their attention on the mother’s irradiation side