选修八件Cloning

1、Learning aims: * To have a good understanding of the reading passage; * To be able to discuss some of the issues associated with cloning. Dolly the sheep Dolly was cloned while the others were born naturally. How does Dolly differ from other sheep? Natural clone is one that occurs in a natural form

2、of cloning without human help. Man-made clone is one that is produced through human intervention(介入介入) . Look at the following pictures and discuss which ones are natural clones and which ones are man-made clones. Discussion Natural or man-made clones? 一株草莓依靠它沿地一株草莓依靠它沿地“爬走爬走”的匍匐茎的匍匐茎,一一 年内就能长出数百株草莓

3、苗年内就能长出数百株草莓苗。 A strawberry plant Growing new plants Twins Do you want to know: 1.What is a clone? 2.How is a clone is produced? 3.What benefits can human gain from cloning? 4.What problems may arise when humans are cloned? Reading: 1. Scan the following passage and match the paragraph with the corr

4、ect sentence. Para 1 A.The problems of Dolly Para 2 B.The two major uses and procedures of cloning Para 3 C.The impact of cloning Dolly Para 4 D.The definition of cloning Para 5 E. Peoples reaction to cloning Fast-reading (5 minutes) 2. The main idea of the text is _. A. Animal cloning is very valua

5、ble and can benefit the world. B. Animal cloning could be misused by bad people so it must be forbidden. C. Animal cloning is well developed because Dolly the sheep was born. D. Animal cloning raised arguments and scientists are not sure about its future. Fast-reading Careful-reading Task1: （para1-2

6、) (3 minutes) 1. What is cloning? 2.What are the two major uses of cloning? 3. Why is it easier to make commercial plant clones than animal clones? Careful-reading Task1: （para1-2) 1.What is cloning? Cloning is a way of making an exact copy of another animal or plant. Careful-reading Task1: （para1-2

7、) 2. What are the two major uses of cloning? The first use is to produce commercial quantities of plants. The second is to research on new plants species and do medical research on animals. Careful-reading Task1: （para1-2) 3. Why is it easier to make commercial plant clones than animal clones? Becau

8、se cloning plants is straightforward while cloning animals is very complicated. Careful-reading Task2: （para3-5) (4minutes) 1. It can be inferred from the passage that a cloned animal_. A. usually lives as long as the original one B. usually lives longer than the original one C. usually lives shorte

9、r than the original one D. is usually as healthy as the original one 推理判断题推理判断题 2. Which of the following is not an advantage of cloning? A. Cloning can be used for medical purposes. B. Large quantities of food can be produced by cloning. C. Cloning can help keep animals from becoming extinct. D. Fa

10、mous persons who have passed away can be cloned. 3. Whats the writers attitude towards cloning? A. Supportive B. Neutral C. Negative D. Subjective 中立的中立的 objective 客观的，客观的， 公正的公正的 Detailed-reading Task1: Group work1 (3minutes) Discuss in groups and then show us the procedure of the cloning of Dolly

11、the sheep. 克隆羊多莉的产生过程（动画）克隆羊多莉的产生过程（动画）.swf.swf The procedure of cloning Dolly the sheep: First, female sheep A provides _, whose nucleus is removed. Female sheep B provides a _ cell, whose nucleus contains all the genes needed to produce a new sheep. Then the nucleus from sheep B and the egg cell f

12、rom sheep A are joined using _. The cell divides and grows into an _, which is put into female sheep C. So she becomes the carrier of the clone. Finally, a new lamb, which is the clone of sheep B, is produced. an egg cell somatic electricity embryo Detailed-reading Task 2: Fill in the chart using th

13、e information from the reading passage. (4minutes) Problems or dangers of cloning Advantages of cloning 1. Animal clones may develop the _ of older animals. 1. Medical cloning could be used to _ serious illnesses in humans. 2. Animal clones may die _ than the donor animals. 2. Gardeners can use clon

14、ing to produce _ qualities plants. 3. _ leaders may want to clone themselves. 3. Cloning is valuable for research on _. 4.There are _ questions of cloning human beings. 4. Cloning is valuable for _ on animals. Answers: Problems or dangers of cloning Advantages of cloning 1. Animal clones may develop

15、 the _ of older animals. 2. Animal clones may die _ than the donor animals. 1. Medical cloning could be used to _ serious illnesses in humans. 2. Gardeners can use cloning to produce _ qualities plants. illnesses cure younger commercial Answers: Problems or dangers of cloning Advantages of cloning 3

16、. _ leaders may want to clone themselves. 4.There are _ questions of cloning human beings. 3. Cloning is valuable for research on _. 4. Cloning is valuable for _ on animals. Evil new plant species moral medical research Challenge yourself: (3minutes) 阅读下面材料，在空白处填入适当的内容（不多于阅读下面材料，在空白处填入适当的内容（不多于3 3个词

17、）或括号内单词的正个词）或括号内单词的正 确形式。确形式。 Cloning is a way of making _ exact copy of another animal or plant. Cloning plants is straight- forward _ cloning animals is complicated. Cloning animals is a difficult task _ (undertake). But at last the determination and patience of scientists _ (pay off) in 1996 with

18、 a breakthroughthe cloning of Dolly the sheep. The fact _ Dolly seemed to develop normally was very encouraging. Then came the disturbing news that she had become seriously ill. Cloning scientists _ (cast down) to find that Dollys illnesses an while to undertake paid off that were cast down Challeng

19、e yourself: were more appropriate to a much _(old) animal. Altogether Dolly lived six and a half years. Dollys appearance raised a storm of _ (object) and had a great impact _ the media and public imagination. It became controversial. Some governments began to reform their legal systems and forbade

20、research into human cloning, but other countries continued to accumulate evidence of the abundant medical aid _ cloning could provide. older objections on that/which Show yourself: Group work2: A Press Conference about cloning A Press Conference about cloning Work in groups of six. One student acts

21、as the host, another student acts as the cloning scientist and the other students are the journalists, and the journalists can ask any questions about cloning. 克隆羊多莉的产生过程（动画）.swf Homework: 1. Read the passage again and underline the sentences in the text containing the appositive phrases（同位语）（同位语）or

22、 appositive clauses（同位（同位 语从句）语从句）. 2.Write a short passage with the title “My opinions on cloning.” First , you state the advantages and disadvantages of cloning. At the end of your passage, you can add your own opinion. Dolly the sheep Dolly was cloned while the others were born naturally. How does Dolly differ from other sheep? Natural clone is one that occurs in a natural form of cloning without human help. Man-made clone is one that is produced through human intervention(介入介入) . 一株草莓依靠它沿地一株草莓依靠它沿地“爬走爬走”