问题 选择题

已知花生的种子大粒对小粒为显性,由A与a控制;含油量少对含油量多为显性,由B与b控制,两对基因独立遗传。现有两个品种甲(AABB)和乙(aabb),需要培育出AAbb品种,培育过程如下图所示。在下列描述中不正确的是

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A.由甲、乙经过①②③步骤培育符合要求的品种的过程能定向改变种群的基因频率

B.F2的大粒油多个体中杂合子占1/3

C.无论正交还是反交,甲、乙两种植株上所结种子胚的基因型相同,种皮的基因型不同

D.⑤过程最常用的方法是用秋水仙素处理幼苗

答案

答案:B

改错题

第Ⅱ卷(非选择题,共35分)

第四部分 写作(共两节,满分35分)

第一节 短文改错(本题共10小题,每小题1分,满分10分)

此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

At your school, who usually makes the decision to punish a             76       

student who is found cheat in an exam or getting into a fight?             77        

“The school authority(官方), of course!”You may say. And in            78        

the No. 10 Middle School, a special student committee has the finally say.   79      

Wang Wei, who was made the president of the committee, told us          80      

that his school encouraged self-education and self-management between    81      

students. The committee deals with students who break away school rules.   82      

And it will collect opinions from the people concerned before handing out   83    

a formal opinion to the school authority. In most case , the school authority   84      

follows their opinions in the end . By this way students who are punished    85      

feel more happy.      

单项选择题