Cloning,Unit 2,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. Cloning is a way of making an exact copy of another animal or plant. The clone has the same DNA as the parent.,Whats cloning?,Sounds Reasonable?,In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ.,Quiz,Dolly the sheep,A strawberry plant,Natural clone,Man-made clone,A strawberry plant,The new plants that grow from the runners （蔓藤植物）are exact copies of the original plant.,Twins,They are born naturally and identical in sex and appearance.,Natural clone is one that occurs in nature without human help.,Man-made clone is one that is produced through human intervention (介入).,Clone,Can you tell the difference between natural clone and man-made clone?,In pairs discuss what you understand about cloning. Then list the questions you want to find out. Share your lists with one another.,Pre-reading,1. 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 produce 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.,2. What benefits can humans gain from cloning？,Medical cloning can help cure serious illnesses that ruin ones quality of life (such as Parkinsons disease or Alzheimers disease). It can help infertile people have babies.,3. What problems may arise when humans are cloned?,People may want to clone themselves so they can live forever. People may want to clone dead children. People may want to clone their favourite pets.,1. What is the main topic? A. Cloning. B. Dolly the sheep . C. It will lead us to some places. 2. What is the writing style? A. Expositive (说明性的). B. Descriptive. C. Argumentative (议论性的).,Cloning: Where is it leading us?,A,A,The main idea of the text is _ A. animal cloning is very valuable 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.,D,Skimming for general idea,Para 1 A. The problems of Dolly Para 2 B. The two major uses of cloning Para 3 C. The attitudes towards cloning Para 4 D. The definition of cloning Para 5 E. The effect of cloning in society,Skimming:match the main idea with each paragraph,Scanning for specific information,From the first paragraph it can be inferred that _. A. cloning is a manmade technology B. cloning always exists around us C. cloning is very strange to human beings D. cloning is only conducted in laboratories,Choose the best answer.,2. 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 dies earlier than the original one D. is usually as healthy as the original one,C,3. 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. Famous persons who have passed away can be cloned.,D,4. We can infer from the last three paragraphs that _. A. the normal development of Dolly had no effect on the cloning of other species. B. Dollys serious disease and final death disturbed the whole world. C. Dolly successfully cloned a new lamb with the help of cloning scientists. D. there were arguments about animal cloning and concerns about the future of cloning.,D,It happens both in _ and in _. They can be cloned by _ and _.,plants,animals,themselves,humans,Natural clone,Man-made clone,Para 1: The definition of cloning,Careful reading,1. How many major uses do cloning have? Firstly, commercial Secondly, research 2. How many female sheep participate in the cloning of a new sheep? 3. When was the cloning of Dolly the sheep born?,3,Para 2: The major uses and procedures of cloning,1996,normally,Dolly lived for six and a half years, half the length of the life of the original one.,Para 3: The problems of Dolly,The word “controversial” in Para 4 probably means _. A. complicated B. arguable C. important,Para 4: The impact of Dolly,B,True or false: 1. People feared that Cloned Hitlers would do harm to the world. 2. All the research into human beings will be forbidden. 3. Some countries will use cloning in a wise way.,Para 5: Peoples reaction to cloning,Many governments forbade research into human beings.,T,T,F,Further understanding,the author does not state any personal opinion about cloning.,A. Objective (be fair) B. Negative (be against