题干
- Is there a school near here?
-
A：Yes, it is.
B：No, there aren't.
C：Yes, there is.
答案(点此获取答案解析）
C
- Is there a school near here?
-
A：Yes, it is.
B：No, there aren't.
C：Yes, there is.
产生配子时等位基因分离，（非同源染色体上的）非等位基因自由组合