A:成对的控制相对性状的遗传因子彼此分离
B:F2(子二代)出现性状分离
C:F2性状分离比是3:1
D:测交后代性状分离比为1:1
已知cosα=﹣45,α为第三象限角.
求sinα,tanα的值;
— , they're in the lab.
What do you do ____(on/in)Sunday ?