荠菜的果实形状有三角形和卵圆形两种,该性状的遗传涉及两对等位基因,分别是A、a和 B、

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问题:

荠菜的果实形状有三角形和卵圆形两种,该性状的遗传涉及两对等位基因,分别是A、a和B、b表示。为探究荠菜果实形状的遗传规律,进行了杂交实验(如右图)。

图中F2三角形果实荠菜中,部分个体无论自交多少代,其后代表现型仍然为三角形果实,这样的个体在F2三角形果实荠菜中的比例为();还有部分个体自交后发生性状分离,它们的基因型是()。

考点:高中生物基因的自由组合定律基因的自由组合定律题库
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下列城市中,是因为矿产资源的开发而吸引大量人口迁入的是

①开罗②伯明翰③约翰内斯堡④悉尼⑤攀枝花⑥新德里⑦大庆[ ]

A.①③④⑥    

B.②③⑤⑦  

C.①②③④  

D.①③④⑦

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(二) 用所学过的短语替换下列各句中的下划线部分,每空一词。(每小题1分,共10分)

1. A: It’s bad manners to laugh at the disabled, especially in public.

B: It’s bad manners to ________ ________ ________ the disabled, especially in public.

2. A: When he climbed to the top of the mountain, it was difficult for him to breathe.

B: When he climbed to the top of the mountain, he was ________ ________ ________.

3. A: In the university, he not only learned English but also French.

B: In the university, he learned French ________ ________ ________ English.

4. A: There are 15 books on the first shelf, and 21 on the second, which makes 36 altogether.

B: There are 15 books on the first shelf, and 21 on the second, which makes 36 _____ ______.

5. A: The hotel manager reserved two pleasant rooms for us.

B: The hotel manager ________ ________ two pleasant rooms for us.

6. A: All of the family jumped with joy when he received a letter from Qinghua University.

B: All of the family jumped with joy when he ________ ________ Qinghua University.

7. A: The students are eager to know the results of the final exam at home.

B: The students ________ ________ ________ know the results of the final exam at home.

8. A: He met his headmaster by chance on the way to school.

B: He ________ ________ his headmaster on the way to school.

9. A: Do you know who will join in the discussion in Shanghai?

B: Do you know who will __________ ________ the discussion in Shanghai?

10. A: That is to say, we can’t afford to buy that expensive car right now.

B: ________ ________ ________, we can’t afford to buy that expensive car right now.

题型:填空题 案例分析题

餐厅服务员的直属上级是()。

A.餐厅经理

B.餐厅副经理

C.餐厅总领班

D.餐厅领班

题型:填空题 案例分析题

当车辆行驶4000~8000Km后,应分别对机油粗滤器和细滤器进行维护并更换()。

A.滤芯

B.滤清器盖

C.滤清器壳体

D.滤清器密封圈

题型:填空题 案例分析题

“有无相生,难易相成,长短相较,高下相倾。”下列对老子的这一思想理解不准确的是()。

A、含有朴素辩证法思想

B、认为世界万物和人类社会不断运动

C、认为事物相互依存且不断相互变化

D、认为对立的东西相互转化

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