下图是基因型为AA的动物细胞分裂某一时期模式图。下列相关叙述正确的是（）_刷题宝

题干

下图是基因型为AA的动物细胞分裂某一时期模式图。下列相关叙述正确的是（）

A：该动物体细胞中染色体数目最多为4条

B：该细胞可能是次级卵母细胞、次级精母细胞或极体

C：若2为X染色体，则3不可能是Y染色体

D：若1上有一基因A，2上有一基因a，则a的出现不可能是基因突变

上一题下一题 0.0难度选择题更新时间:2016-10-25 06:07:29

答案(点此获取答案解析）

C

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根据短文内容理解, 选择正确答案。

Hello! I am Oliver Smith. I am from UK. I can speak English well but my Chinese is not good. I like doing sports after school. My favorite sports are running, basketball and swimming. I like to be a sports star when I grow up. I have good eating habits. I don't eat ice-cream, hamburgers or cola because I know they are not healthy. I also don't like to be fat, so I like eating vegetables and fruit.

I have a good friend. His name is Chen Lin. He is not good at sports, but he's good at art. He sings well and draws well. He drew a nice picture for me on my birthday. I was excited. We sometimes play games together after school. We always have much fun. If you like us, join us! We can be friends and have a great time together!

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在用酒精灯加热铜球时，我们要用酒精灯火焰的____去加热。

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F_{1} (- 4, 0)

F_{2} (4, 0)

C : \frac{x^{2}}{m} - \frac{y^{2}}{4} = 1 (m > 0)

的两个焦点，点

M

C

上一点，且

∠ F_{1} M F_{2} = 60 °

F_{1} M F_{2}

的面积为____.

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原核生物中某一基因的编码区起始端插入了一个碱基对．在插入位点的附近，再发生下列哪种情况有可能对其编码的蛋白质结构影响最小（　　）

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下列各句中，加点的成语使用恰当的一项是

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