【单选题】关于冬季调和汽油叙述正确的是?( ) 选择一个答案
【单选题】基因型为AAbbCC与aaBBcc的小麦进行杂交,得到F 1 ,F 1 形成的配子种类数,F 1 自交后代F 2 的基因型种类数分别是 [ ]
【简答题】A.There are two buses every day. B.The train is cheaper than the bus. C.The bus is cheaper than the train. D.The train is faster than the bus.
【简答题】A.The bus is coming. B.The bus has left. C.The bus has arrived. D.There comes the bus.
【单选题】将基因型为AaBbCc和AABbCc的向日葵杂交,按基因自由组合规律,后代中基因型为AABBCC的个体比例应为 [ ]
【单选题】将基因型为AABBCC和AaBbCc的向日葵杂交,按基因自由组合规律,后代中基因型为AABBCC的个体比例应为: [ ]