用基因组成是Aa的青州蜜桃枝条为接穗,嫁接到基因组成为aa的青州蜜桃砧木上,所结蜜桃果肉细胞的基因组成为Aa的几率是
A:25%
B:50%
C:75%
D:100%
— What's the matter with the computer?
—It is dead now.