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Reading of unit 2 Cloning Book 8_图文

In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ.

It’s the most famous
sheep in the world. Do you know how Dolly is different from other sheep? Dolly the sheep

She was cloned while the others were born naturally. It is the copy of another sheep.

What can you see in the picture? I can see a strawberry plant producing runners in a natural form of cloning.

Who cut the stem off the plant? A gardener. The gardener is going to put it into a pot to produce another plant. He is actually making a copy of the plant.

What do you know about twins?

There are twins of the same sex and those of different sexes. The twins here are identical in sex and appearance and are good examples of natural clones. They carry the same genetic information. The fertilized egg has split into two while inside the mother, and so produced two identical human babies.

Are the following clones the same? If not, what is the difference?

No. The first two are man-made clones.

The rest two are natural clones.

Questions about cloning: 1. What is a clone?

A clone is an animal or plant
produced naturally or artificially

from the cells of another animal or
plant and is exactly the same as it.

2. How is a clone produced? The cloning of plants is simple and relatively easy. It can be done by taking cuttings (man-made cloning) or letting the plant produce its own runners (natural cloning). The cloning of animals is more complicated. It was not achieved until 1996 and is fully explained in the first reading.

3. What benefits can humans gain from cloning?

1) Medical cloning can help cure serious illnesses that ruin one’s quality of life (such as Parkinson’s disease帕金森症 or Alzheimer’s disease老年痴呆症). 2) It can help infertile people have babies.

4. What problems may arise when humans are cloned? 1) People may want to clone themselves so they can live forever. 2) People may want to clone dead children. 3) People may want to clone their favorite pets.

Read the text quickly and complete its main idea.

The text is mainly about the 1. _________ procedure of animal cloning and the life of Dolly the sheep, as well as the reasons why cloning is still 2. ___________. controversial

Read through the passage and find the main idea of each paragraph.
Para 1. Cloning is a way of making an exact copy of another animal and plant. Para 2. Cloning has two major uses. Para 3. The birth and death of Dolly. Para 4. The effect of Dolly. Para 5. It is forbidden to clone human beings.

Read the text carefully and fill in the blanks.

Definition Cloning is a way of making ____________ an exact copy of another animal and plant. Major ? Gardeners use it to produce _______ uses of commercial quantities of plants. cloning ? It is valuable for research on new plant species and for _______ medical research on animals.

About ◆ Encouraging news: Dolly normally Dolly seemed to develop ________. the ◆ Disturbing news: Dolly lived sheep only six and a half years, half the length of the life of the original _______ sheep, because of serious illnesses which were more appropriate to a ________________. much older animal

Choose the best answer. 1. As for the cloning procedure of Dolly the sheep, all of the following are true EXCEPT _____. C A. the lamb is the clone of the donated cell from sheep B B. electricity is needed C. female sheep B provides an egg cell D. three female sheep are used

2. From the last paragraph we know that _____. C A. cloning will come to an end because of objections B. cloned human beings will be produced in the near future C. many countries will use cloning in a wise way D. all the research into human cloning will be forbidden

Write the letter “T” if the statement is true. Write “F” if it is false. 1) Cloning means making a copy of an animal or a plant. F 2) Gardeners can make a lot of money by cloning plants. T 3) Cloning animals is as complicated as cloning plants. F

4) Dolly the sheep was the first successful clone of a mammal. T 5) Natural clones happen in animals as well as in plants. T

Look at these pictures, and discuss this question with your partner. Is cloning people a good thing or a bad thing?

1. 克隆技术现在还不成熟 , 克隆人 可能有很多先天性生理缺陷。 2. 克隆人的身份难以认定 , 他们与 被克隆者之间的关系无法纳入现 有的伦理体系。

3. 克隆技术有可能被滥用, 成为恐怖分 子的工具。 4. 从生物多样性上来说, 大量基因结构 完全相同的克隆人, 可能诱发新型疾 病的广泛传播, 对人类的生存不利。

1. “不让我们克隆人, 就是不让我们修正我们 的错误, 人类历史难道能够这样构造 吗?” —《纽约时报书评》 2. “当然应该‘克隆’人, 如果谁第一个掌握 了这个技术, 他就是我真正的、也是唯一 的竞争对手。” — 比尔· 盖茨

3. “克隆人绝对是科学上了不起的进步, 克 隆技术必将创造21世纪的辉煌。”

— 麻省理工学院教授 约翰 · 布洛克
4. “人体商业化是人类经济活动中无与伦比 的成就, 毫无疑问, 克隆技术的出现将为 世人创造一个最为广泛和深远的市 场。” — 英国《经济学家》杂志

Do you know about the procedure works of a sheep?

Reproductive cloning is intended to opy of an existing a_____ nimal or a produce a c___ plant. Reproductive cloning of animals is a______ llowed for technology and farming as ndangered animals. well as for cloning e_________ But reproductive cloning of human orbidden by law in beings is specifically f________ ountries most c_______.

Therapeutic (治疗的) cloning is to produce a healthy copy of a s___ ick person’s tissue (肌肉 组织) or organ for transplant in order to save the lives of those who would d___ ie without it. echnique would be many times better This t________ elying on organ transplants from than r______ other people. The tissue or organ would have the sick person’s original DNA.


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