题目

一个基因为AaBb的卵原细胞(按自由组合规律遗传)假定产生了一个基因组合为AB的   卵细胞。则随之产生的三个极体的基因组合应为    (    )   A，Ab、aB、ab    B.AB、ab、ab    C．ab、ab、ab D．AB、AB、AB   答案：B根据图片回答问题。1.What are those farmers doing? _________________________________________________2. What are those farmers doing? _________________________________________________3. What are those farmers doing? _________________________________________________4. What are those farmers doing? _________________________________________________5. What are those farmers doing? _________________________________________________