【单选题】女,2岁。因智力低下就诊,查染色体核型为46,XX,-21,+t(21q21q),其母亲核型为45,XX,-21,2l,+1(2lq21q),若再生育,其下一代发生本病的风险为
【单选题】The car-renting rate remains $ 99if you ______.
A.
return the car to where you rent it
B.
drive within the same city
【简答题】阅读理解。 When you are in Hongkong, you must be very careful in the streets because the traffic drives on the left. It is different from that in other areas of China. If you are the first time to come to ...
【单选题】母亲的核型为 45 , XX ,- 21 ,- 21 ,+ t ( 21 ; 21 )( p11 ; q11 ),其子患先天愚型的可能性是( )。
【单选题】女,2岁。因智力低下就诊,查染色体核型为46,XX,-21,+t(21q21q),其母亲核型为45,XX,-21,-21,+t(2lq21q)。若再生育,其下一代发生本病的风险为
【判断题】等温扩增技术是核酸体外扩增新技术,在恒温条件下通过添加不同活性酶蛋白和特异性引物(或可不加)来达到快速核酸扩增反应的目的。
【单选题】He did his homework carefully for fear that he ___
【单选题】女,2岁。因智力低下就诊,查染色体核型为46,XX,一2l,+t(21q21q),其母亲核型为45,XX,一21,21,+t(21q21q),若再生育,其下一代发生本病的风险为
【单选题】He did his homework carefully for fear that he ___