等位基因A与a的最本质的区别是()
A.A控制显性性状,a控制隐性性状
B.在减数分裂时A与a分离
C.两者的碱基序列不同
D.A对a起显性的作用
参考答案:C
He's now used to ______ early. But he used to ______ late in the morning. [ ]
A. getting up; sleep
B. get up; sleep
C. getting up; sleeping
D. get up; sleeping