问题
选择题
在基因型为AaBb的某雄性动物所产生的1000个精子中，既含有两个隐性基因，又含有Y染色体的精子约有[ ]
A．1000个
B．500个
C．250个
D．125个
答案
答案：D
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在基因型为AaBb的某雄性动物所产生的1000个精子中，既含有两个隐性基因，又含有Y染色体的精子约有[ ]
A．1000个
B．500个
C．250个
D．125个
答案：D
American people like to “Thank you” when others help them or say to them. Many Chinese people do so, . It is a very . You must say “Thank you” when someone passes you something on the table, when someone the door open for you, when someone says you do your work , or you buy a nice thing or your city is “Excuse me” is another sentence（句子）they often say. When you hear someone say “Excuse me” you, you know he wants to pass you without touching（接触）you. If you want others, say “Excuse me” first, and then begin talking. Let’s “Thank you: and “Excuse me” from now.
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