题目

大豆的白花和紫花是一对相对性状．下列四组杂交实验中，能判断显性和隐性关系的是（）①紫花╳紫花→紫花           ②紫花╳紫花→301紫花+101白花③紫花╳白花→紫花           ④紫花╳白花→98紫花+102白花．      A．①和②             B． ③和④                  C．   ①和③    D． ②和③ His son often ______with me after school.A. walks to home B. walks homeC. walk to home D. walk home