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1、Unit 2 Cloning,Natural clone or,Man-made clone？,Dolly the sheep,A strawberry plant,Growing new plants,Twins,is one that occurs in nature.,A natural clone,is one that is produced through human intervention.,(人类介入）,A man-made clone,Dolly the sheep,She was while the others were born .,How does Dolly di
2、ffer from other sheep?,man-made clone,cloned,naturally,Skim the passage and get the main idea of each paragraph.,Para 1 Para 2 Para 3 Para 4 Para 5,The definition of cloning,The two major uses and the Procedure of cloning,The problem of Dolly,The effect of cloning in society,The attitudes towards cl
3、oning,Whats the writing style? Expositive(说明性的) Argumentative（议论性的） Narrative（叙事性的） Descriptive（描写性的）,Para 1 The definition of cloning,definition: It is a way of making an exact copy of another animal and plant.,Cloning happens both in _ and in_. They can be cloned by _ and_.,plants,animals,themselv
4、es,humans,Natural clone,Man-made clone,1.The word “straightforward” means _. uncomplicated honest frank difficult,Para 2,The major uses and procedures of cloning,2.The cloning of Dolly the sheep succeeded because_. A. its easier to clone a sheep than other animals B. the scientists were determined a
5、nd worked hard with patience C. the scientists were rewarded and got lots of money D. many other attempts to clone mammals failed,The determination and patience of the scientists paid off. (L9),3.The lamb is the clone of the cell from sheep B because . A. it provides the egg cellB. it gives birth to
6、 the lambC. it provides the nucleusD. it is a female sheep,产出,有核卵细胞,无核卵细胞,体细胞,取出细胞核,用电融合细胞,代孕母羊,细胞分裂形成胚胎,How to produce a sheep （我也来当科学家）,True or false :,Four female sheep participate in the cloning of a new sheep. Electricity is needed in the procedure. Sheep B provides a somatic cell for the clone
7、. The lamb is the exact copy of sheep A.,T,F,T,F,At first, the fact that Dolly seemed to developed _ was _. Then, came the news that Dolly became_. Altogether Dolly lived_, half the length of the life of _.,Para 3,The problems of Dolly,normally,encouraging,the original sheep,seriously ill,six and a
8、half years,The sheep that donated the somatic cell most probably lived _years. A. 3 B. 6 C. 9 D. 13,Problems: Cloned animals may develop the_of older animals. Cloned animals may lives _ the original one.,as long as / shorter than / longer than,illnesses,shorter than,The word “controversial” in parag
9、raph 4 probably means_. A. complicated B. arguable C. important,Para 4,The impact of Dolly,On the other hand, Dollys appearance raised a storm of objections and had a great impact on the media and public imagination.,Translation,True or false: 1 People feared that Cloned Hitlers would do harm to the
10、 world. 2 All the research into human beings will be forbidden. 3 Some countries to accumulate evidence of the abundant medical aid that cloning could provide.,Para 5,Peoples reaction to cloning,Many governments forbade research into human cloning.,Cloning is a way of _ an exact copy of another anim
11、al or plant. Cloning has two _ uses. Firstly, gardeners use it to produce plants. Secondly, it is _ for medical research on animals. Cloning plants is straightforward but the cloning of animals is more_. The procedure is difficult to _. In 1996, scientists succeeded in _Dolly the sheep. Then came th
12、e disturbing news that Dolly was ill. _ Dolly lived for six years and a half , Dollys appearance raised a storm of _. Government became nervous and many _ research into human cloning. Scientists still _ whether cloning will help or harm us and where it is leading us.,making,major,valuable,complicate
13、d,undertake,cloning,Altogether,objections,forbade,wonder,Summary,As a coin has two sides, everything has two aspects. On one hand, if cloning is used in a correct way it can bring many convenience to us. On the other hand, if cloning is used in an evil way it can cause much trouble. Therefore, we should use cloning in a correct way.,the author does not state any personal opinion about cloning.,A. Objective (be fair) B. Negative (be against it) C. Positive (be in favor of it),The writers attitude towards cloning,Because_,Homework,Preview language points in the text.,