标准型21-三体综合征的核型为( )
A:47,XY(XX),+21
B:46,XY(XX),-21,+t(21q21q)
C:46,XY(XX),47,XY(XX),+21
D:46,XY(XX),-14,+t(14q21q)
E:45,XY(XX),-14,-21,+t(14q21q)
出自:小儿内科学高级职称