Using LanguageⅡ名师教学视频（文字实录）

选修8 Unit 2 Reading Background：

Through asking students what a clone is and the difference between man-mad clone and natural clone, students can express their feelings about cloning, such as their opinions about twins, clone sheep, clone babies and so on. What’s more, by discovering the advantages and disadvantages of cloning, students will have a better understanding of clone and it will be good for their studying of the passage. Teaching goals

1. Target language

a. key words and expressions clone, commercial, producer, undertake, arbitrary, object, forbid, accumulate, cast down, object to, the media, in favour of b. key sentences It is a way of... The fact is that... The question that occurred ... 2. Ability goals

Enable the students to describe cloning: What is the advantages of cloning？

What is the problems or dangers of cloning？What is your opinion of cloning？

3. Learning ability goals

Help the students learn how to describe cloning. Teaching important points

How to describe cloning.

Teaching difficult points

Help the students analyze the writing techniques of the article. Teaching methods

Skimming, task-based method and debate method. Teaching aids

A recorder, a projector and some slides.

Teaching procedures && ways

Step I Warming up Question: what is cloning and a clone? 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 thing first, what is cloning and a clone? Clone sounds very different and complicated to us. In fact, I mean, in our daily life, this happens often. For example, gardeners take cuttings from growing 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 original egg. The fact is that cloning plants is straightforward but the cloning of animals is more complicated. The dictionary says cloning is the technique of producing a genetically identical duplicate of an organism.

You can give your questions if you are interested in this topic. I am here today one of the scientists who work in this field. I am ready to answer any of your questions. Question: Now we know what is cloning. Are there different types of cloning? When the media report on cloning in the news, they are usually talking about only one type called reproductive cloning. There are different types of cloning however, and cloning technologies can be used for other purposes besides producing the genetic twin of another organism. A basic understanding of the different types of cloning is key to taking an informed stance on current public policy issues and making the best possible personal decisions. The following three types of cloning technologies will be discussed: (1) recombinant DNA technology or DNA cloning, (2) reproductive cloning, and (3) therapeutic cloning.

Questions: Was Dolly created by what cloning? And why was Dolly so important?

Reproductive cloning is a technology used to generate an animal that has the same nuclear DNA as another currently or previously existing animal. Dolly was created by reproductive cloning technology. She was the first mammal to be cloned from adult DNA taken from an adult cell. Previously, animals had only been cloned using

embryo cells which already have the potential to become a complete embryo in its own right. The big breakthrough with Dolly was to make a clone from an ordinary, adult cell — in this case from a female goat’s udder. Questions:

Have you seen Jurassic Park? In this feature film, scientists use DNA preserved for tens of millions of years to clone dinosaurs. They find trouble, however, when they realize that the cloned creatures are smarter and fiercer than expected. Could we really clone dinosaurs? In theory? Yes. What would you need to do this? A well-preserved source of DNA from the extinct dinosaur, and a closely related species, currently living, that could serve as a surrogate mother. In reality? Probably not. It’s not likely that dinosaur DNA could survive undamaged for such a long time. However, scientists have tried to clone species that became extinct more recently, using DNA from well-preserved tissue samples. More questions about cloning

1. Do you want to be cloned or not? Why?

2. If you are the judge what will you do? 3. Can you tell me the advantages of cloning? 4. And what is the disadvantage? Discussion In this part the students will discuss the relationship between the development of technology and social customs.

As the technology develops day by day, it has a more and more important influence on the whole society. Technology affects social customs and ethics, sometimes technology may go against the conventional thinking, then comes the problem that whether we should stop the development of research or change the ethics. Advantages: 1. cloning helps people live a better life.

2. cloning helps scientists do more research.

Disadvantages: 1.

Some people may clone themselves. 2.

Some bad people can do anything bad to the society with cloning. …

Reviewing of the lesson and pre-reading:

Questions 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? Suggest 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 twins 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.