问题
单项选择题
按自由组合定律遗传，能产生四种类型配子的基因型是（）
A.YyRR
B.MmNnPP
C.BbDdEe
D.Aabb
答案
参考答案：B
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按自由组合定律遗传，能产生四种类型配子的基因型是（）
A.YyRR
B.MmNnPP
C.BbDdEe
D.Aabb
参考答案：B
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| I 1 pretty healthy. I exercise every day, usually when I come home 2 school. And my 3 habits 4 pretty 5 . I try to eat a lot of 6 , usually ten or eleven times a week. I eat fruit every day and I drink milk every day. Of course, I love junk food, too, but I try 7 it only once a week. Oh, I sleep nine hours every night. So you see, I 8 my health. And it 9 a big difference for my grades. Good food and exercise help me 10 more. | ||||
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