猫叫综合征的核型是?
A.47,XY,+21
B.47,XX,+13
C.47,+21
D.46, XX(XY), del ( 5 ) ( p15 )
一名女性核型为45,XX,-14,-21,+t(14q21q),当她与一名核型正常的男性婚配时,生育表型正常的孩子的概率是?
A. 1/6
B. 1/3
C. 1/2
D. 1/4
Foodborne illness is caused by?
A. bacteria
B. virus
C. microorganism
D. preservative