1、Reading,Unit 2 Cloning,In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ.,Warming up,Dolly the sheep,Its the most famous sheep in the world. Do you know how Dolly is different from other sheep?,man-made clones,She was
2、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.,natural clones,Who cut the stem off the plant?,A gardener. The gardener is going to put it into a pot to produce
3、 another plant. He is actually making a copy of the plant.,man-made clones,What do you know about twins?,natural clones,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 geneti
4、c 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 c
5、lone?,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 p
6、roduce 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 ones quality of life (such as
7、Parkinsons disease帕金森症 or Alzheimers 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 p
8、ets.,The text is mainly about the 1. _ of animal cloning and the life of Dolly the sheep, as well as the reasons why cloning is still 2. _.,controversial,procedure,Read the text quickly and complete its main idea.,Read through the passage and find the main idea of each paragraph.,Cloning is a way of
9、 making an exact copy of another animal and plant. Cloning has two major uses. The birth and death of Dolly. The effect of Dolly. It is forbidden to clone human beings.,Para 1. Para 2. Para 3. Para 4. Para 5.,Read the text carefully and fill in the blanks.,an exact copy,produce,medical,normally,orig
10、inal,much older animal,Choose the best answer. 1. As for the cloning procedure of Dolly the sheep, all of the following are true EXCEPT _. 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,C,2. Fro
11、m the last paragraph we know that _. 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,C,(1) Cloning means making a copy of an anima
12、l or a plant. (2) Gardeners can make a lot of money by cloning plants. (3) Cloning animals is as complicated as cloning plants.,F,T,F,Write the letter “T” if the statement is true. Write “F” if it is false.,T,T,(4) Dolly the sheep was the first successful clone of a mammal. (5) Natural clones happen
13、 in animals as well as in plants.,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。,反对克隆人,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
14、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,支持克隆人,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。” 麻省理工学院生命工程教授约翰布洛克 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?,Reprod
15、uctive cloning is intended to produce a c_ of an existing a_ or a plant. Reproductive cloning of animals is a_ for technology and farming as well as for cloning e_ animals. But reproductive cloning of human beings is specifically f_ by law in most c_.,opy,nimal,ndangered,llowed,orbidden,ountries,Con
16、solidation,Therapeutic (治疗的) cloning is to produce a healthy copy of a s_ persons tissue (肌肉组织) or organ for transplant in order to save the lives of those who would d_ without it. This t_ would be many times better than r_,ick,ie,echnique,elying,on organ transplants from other people. The tissue or organ would have the sick persons original DNA.,Finish activities 2 and 3 on Page 12.,Homework,Thank you!,