高中英語(yǔ)unit2cloning教學(xué)設(shè)計(jì)1新人教版選修8-wenkub.com
2024-11-30 23:41 本頁(yè)面
【正文】 全句意思是：多利的出現(xiàn)引起一場(chǎng)反對(duì)風(fēng)暴，并且對(duì)媒體和公眾思想產(chǎn)生了很大的沖擊。 ways 教學(xué)過(guò)程與方式 Step I Leadin This topic is difficult for students. So teacher should help the students learn more about it. Do this in the way of asking and answering questions. T: 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 Dolly 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 geically identical duplicate of an anism. 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. It sounds very different and plicated 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 plicated. The possibility of human cloning, raised when Scottish scientists at Roslin Institute created the muchcelebrated sheep Dolly, aroused worldwide interest and concern because of its scientific and ethical implications. 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. S: Now we know what is cloning. Are there different types of cloning? T: 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 geic twin of another anism. 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) rebinant DNA technology or DNA cloning, (2) reproductive cloning, and (3) therapeutic cloning. S: Was Dolly created by what cloning? And why was Dolly so important? T: 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 bee a plete 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. S: 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. T: In theory? Yes. What would you need to do this? A wellpreserved source of DNA from the extinct dinosaur, and a could serve as a surrogate mother. In reality? Probably not.
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