题目

补全对话A: How are you?B: 1._______________A: Nice to meet you.B: 2._______________ 答案：【答案】1. Fine, thank you. 2. Nice to meet you, too. 【解析】略如果精原细胞有三对同源染色体A和a,B和b,C和c。下列4个精子是来自于同一个精原细胞的是 A.AbC,aBC,Abc,abc       B.aBc,AbC,aBc,AbC C.abC,abc,aBc,ABC       D.AbC,Abc,abc,ABC