题目

在完全显性条件下，基因型为AaBbcc与aaBbCC的两亲本进行杂交(这三对等位基因是独立遗传的)，其子代中表现型不同于双亲的个体占全部子代的：                                                                                               A.  0          B.  37.5%           C.  62.5%            D.  100% – I’ m sorry I stepped outside for a smoke. I was very tired.    - There is no      for this while you are on duty    A. reason    B. excuse    C. cause    D. explanation