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1、【精品文档】如有侵权，请联系网站删除，仅供学习与交流新课标人教版选修八Unit 2 Cloning教案.精品文档.Unit 2 CloningThe First Period Warming up and ReadingTeaching goals1.Enable the students to describe cloning: What is the advantages of cloning？ 2.Help the students analyze the writing techniques of the article.Teaching procedures Step I Warmi
2、ng up一: You can imagine how rapidly the modern science and technology develop. I think most of you must know something about space traveling, submarine exploration, robot, maglev train, gene engineering etc. But in recent years, a hot topic, cloning is often mentioned, especially when the cloning Do
3、lly the sheep appeared. You may have first heard of cloning when Dolly the Sheep showed up on the scene in 1997. Cloning technologies have been around for much longer than Dolly, though. First things first, what is cloning and a clone? The dictionary says cloning is the technique of producing a gene
4、tically identical duplicate of an organism. A clone is said to be all descendants derived asexually from a single individual, as by cuttings, bulbs, by fission, by mitosis, or by parthenogenesis reproduction. In fact, in our daily life, this happens often. For example, gardeners take cuttings from g
5、rowing plants to make new ones. You often see that your mother picks a small branch from a growing plant to make a new one. If she likes this kind of flowers, she can do cloning. Cloning also happens in animals or human beings when twins identical in sex and appearance are produced from the same ori
6、ginal egg. Discussion 1. Do you want to be cloned or not? Why?2. Can you tell me the advantages of cloning?3. And what is the disadvantage?二：Look at picturesLook at the pictures and discuss which ones are natural clones and which ones are man made. Then explain how they differ.Step II Pre-reading（Be
7、fore class, ask the students to search for some information about this topic.） Now show your questions on the screen, and then let them discuss with each other.Now please work in pairs and discuss about cloning. Then list the questions you want to find out. Share your list with your partner.Question
8、s about cloning:1. What is a clone?2. How is a clone produced?3. What benefits can humans gain from cloning?4. What problems may arise when humans are cloned?5. Should we clone human?6. Could cloning replace sex as the means of creating new human life?7. Could a parent clone a child who is dying of
9、a terminal illness?Suggested answers:1. It is a way of making an exact copy of another animal and plant.2. This happens in plants when gardeners take cuttings from growing plants to make new ones, and when small parts of a plant are taken and gown in a laboratory. It also happens in animals when twi
10、ns identical in sex and appearance are produced from the same original egg.3. It can help cure disease and can help couples who have no baby to bear a new baby.4. There may be more bad people like Hitler.5. In my opinion, I do not agree, for it may cause many moral problems.6. No. Because cloned hum
11、an has the same quality as the real human, natural born babys quality is higher than his parents.7. No. The cloned baby also has the disease.Step III Fast- readingHave you not the answers of your questions? Now please skim the passage fast to obtain a general understanding of the whole passage into
12、several parts and find out the main idea of each part.Show the following.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 problems of Dolly.Para. 4 The effect of Dolly.Para. 5 It is forbidden to clone human being.Step IV Care
13、ful-reading1.Ask the students to read the passage carefully to finish exercise1on page12 in the students book.2.Check the answers. 3.Finish exercise2on page12 in the students book.4. Check the answers5.Explanation1.)It is a way of making an exact copy of another animal and plant. 全句汉语意思:它是一种精确复制另一个动
14、物或植物的方式。Here a way of means a manner of 一种的方式。2.） Dollys appearance raised a storm of objections and had a great impact on the media and public imagination. In this sentence, raise means lead. (引起/导致)。全句意思是：多利的出现引起一场反对风暴，并且对媒体和公众思想产生了很大的冲击。3.） However, scientists still wonder whether cloning will he
15、lp or harm us and where it is leading us. “whether cloning will help or harm us”, “where it is leading us” is the objects of the word “wonder” 全句意思是：科学家一直致力于研究克隆到底会有助于我们还是会伤害我们，它们将我们引向何方。Step V HomeworkAsk the students to do the following.1. Complete the exercises on page 13.2. Recite the key senten
16、ces in the text.3. What is Cloning? You might not believe it, but there are human clones among us right now. Have you ever wished you could have a clone of yourself to do homework while you hit the skate park or went out with your friends? Imagine if you could really do that. Where would you start?The second period Learning about language(1)Teaching Goa
