[名词解释] 21-三体综合征

干性骨疡 Brodie脓肿 成角 脊椎滑脱 某夫妻均为常染色体隐性遗传病携带者，则其出生儿发病概率为() ["A．1/4","B．1/2","C．100%","D．1/8","E．1/16"] 21-三体综合征