The karyotype of most Down syndrome is ( )
A、45, XX(XY), -14, -21, +t (14q21q)
B、46, XX(XY)/ 47, XX(XY), +21
C、45, X
D、46, XX(XY)
E、47, XX(XY), +21
发布时间：2025-07-23 14:27:33
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答案：E
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