问题

Down综合征最常见的核型是
A:45,XO
B:46,XX(XY),-14,+t(14q21q)
C:45,XX(XY),-14,-21,+t(14q21q)
D:47,XX(XY),+21 E.45,XO/46,XX
B:46,XX(XY),-14,+t(14q21q)
C:45,XX(XY),-14,-21,+t(14q21q)
D:47,XX(XY),+21 E.45,XO/46,XX
正确答案是: