(5分)一对夫妇均是双眼皮,却生了个单细皮的女孩.他们感到颖惑!莫非在医院抱错了

题型:实验题

问题:

(5分)一对夫妇均是双眼皮,却生了个单细皮的女孩.他们感到颖惑!莫非在医院抱错了?你能运用所学知识设计实验帮助这对夫妇解开心中的谜团吗?

(1)从遗传学的角度看,人的单眼皮和双眼皮是一对      ,受遗传基因的控制.亲代的基因通过        传递给后代.

(2)实验步骤:①取3支试管,分别抽取女儿和其父母的血液各1毫升,放入试管并编号.

②用相关的仪器提取3个人的DNA,进行位点比对.

(3)实验结果分析:通过比对,女儿的DNA与父母的DNA各有      相同;其原因是                                       

(4)结论:根据DNA的比对结果,从而确定女儿与其父母的关系.

(5)如果用B表示控制双眼皮的基因,用b表示控制单眼皮的基因,且B对b为显性.则该家庭中父亲、母亲和女儿的基因型分别是:                         

考点:基因控制生物的性状
题型:实验题

在总账系统中,记账后形成的记账凭证文件的主要用途是()。

A.登记总分类账

B.产生各类总账、明细账和日记账

C.进行记账凭证汇总

D.编制报表

题型:实验题

一个三位数各位数字的和是12,它的个位数字比十位数字大1,若把它的百位数字和个位数字互换,则所得的数比原数小99,求原数.

题型:实验题

与圆x2+(y-2)2=1相切,且在坐标轴上截距相等的直线有(  )

A.2条

B.3条

C.4条

D.6条

题型:实验题

Graves病甲亢甲状腺的特点是()

A.症状越严重甲状腺越大

B.甲状腺质地较硬且有触痛

C.用碘剂可使甲状腺变软

D.甲状腺呈弥漫性对称性肿大

E.甲状腺囊肿

题型:实验题

Northern Europeans spend a lot of time in their cold and cloudy winters planning their summer holidays. They are proud of their healthy color when they return home after the holiday. But they also know that a certain amount of sunshine is good for their bodies and general health.

In ancient Greece people knew about the healing(治疗) powers of the sun, but this knowledge was lost. At the end of the nineteenth century a Danish doctor, Niels Finsen, began to study the effect of sunlight on certain diseases, especially diseases of the skin. He was interested not only in natural sunlight but also in artificially (人造地) produced rays. Sunlight began to play a more important part in curing sick people.

A Swiss doctor, Auguste Rollier, made full use of the sun in his hospital at Lysine. Lysine is a small village high up in the Alps. The position is important: the rays of the sun with the greatest healing power are the infra-red (红外线的) and ultra-violet (紫外线的) rays; but ultra-violet rays are too easily lost in fog and the polluted air near industrial towns. Dr. Roller found that sunlight, fresh air and good food cure a great many diseases. He was particularly successful in curing certain forms of tuberculosis with his “sun-cure”.

There were a large number of children in Dr. Roller’s hospital. He decided to start a school where sick children could be cured and at the same time continue to learn. It was not long before his school was full.

In winter, wearing only shorts, socks and boots, the children put on their skis after breakfast and left the hospital. They carried small desks and chairs as well as their school books. Their teacher led them over the snow until they reached a slope which faced the sun and was free from cold winds. There they set out their desks and chairs, and school began.

Although they wore hardly any clothes, Roller’s pupils were very seldom cold. That was because their bodies were full of energy which they got from the sun. But the doctor knew that sunshine can also be dangerous. If, for example, tuberculosis is attacking the lungs, unwise sunbathing may do great harm.

Today there is not just one school in the sun. There are several in Switzerland, and since Switzerland is not the only country which has the right conditions, there are similar schools in other places.

1. According to the passage, when did sunlight begin to play a more important part in the treatment of disease?

A. From ancient times.         B. At the end of the nineteenth century.

C. Not until this century.              D. Only very recently.

2. Why are a Danish doctor and a Swiss doctor mentioned in the second and third paragraphs?

A. Because they both made use of sunlight to treat illness.

B. Because they were the first people who used sunlight for treatment.

C. Because they were both famous European doctors.

D. Because they used sunlight in very different ways.

3. Dr Roller set up a “sun-cure” school probably for the reason that _______.

A. most children could stay in his hospital

B. children could study while being treated

C. the school was expected to be full of pupils

D. the school was high up in the mountains

4. What can be inferred from the last paragraph of the passage?

A. “Sun-cure” schools are becoming popular everywhere.

B. Switzerland is the only country where “sun-cure” schools are popular.

C. Proper conditions are necessary for the running of a “sun-cure” school.

D. “Sun-cure” schools are found in countries where there is a lot of sunshine.

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