基因型为aaBb的个体与AaBb个体杂交,F1表现型的比例是()
A.9:3:3:1
B.3:1
C.3:1:3:1
D.1:1:1:1
参考答案:D
The girl who is studying at the art college has a _____ for music and dance. [ ]
A. gift
B. present
C. power
D. strength
酸性磷酸酶染色阴性的细胞是()
A.多毛细胞白血病细胞
B.尼曼-匹克细胞
C.T淋巴细胞
D.淋巴肉瘤细胞
E.转移癌细胞