同課異構(gòu)cloning課件.ppt

1、,Welcome to our class!,Ready to have fun learning English?,Teaching aims: 1.Get the Ss to improve reading skills. 2.Make the Ss learn more about cloning. 3.Let the Ss master the target words, phrases and sentence structures.,選修八,Unit 2 Cloning,Reading,Lets enjoy a movie clip,Twins,They are born natu

2、rally and identical in sex and appearance.,A strawberry plant,The new plants that grow from the runners are exact copies of the original plant.,一株草莓依靠它沿地“爬走”的匍匐莖, 一年內(nèi)就能長(zhǎng)出數(shù)百株草莓苗。,Growing new plants,What do you know about Clone?,Natural clone,Man-made clone,Natural clone is one that occurs from the “p

3、arent” in a natural form of cloning without human help.,Man-made clone is one produced through human intervention (介入) .,natural clones,natural clones,man-made clones,cloned animals,富貴竹插枝即活,The gardener should cut the plant, then the cutting produce another new plant.,1996 cloning sheep,2001 cloning

4、 cattle,2005 cloning dogs,The advanced technique in genetics (遺傳學(xué)) with which scientists can create or copy things with the same DNA.,What is a clone?,Discussion,Scientific Definition,Cloning is the creation of cells or whole animals by using DNA from a single “parent”, not with the normal reproduct

5、ive process. The clone has the same DNA to the “parent”.,Reading,A.The attitudes towards Dollys appearance. B.The problems of Dolly. C.The definition of Cloning. D.The effect of cloning on society. E.Cloning has two major uses.,Para. 1 Para. 2 Para. 3 Para. 4 Para. 5,The main idea of each paragraph.

6、,Task1,Present the procedure of How to produce the sheep Dolly,1.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

7、.animal cloning raised arguments and scientists are not sure about its future.,Task2,Skim the text and choose the best answers.,2. The cloning of Dolly the sheep succeeded because_. A. its easier to clone a sheep than other animals. B. the scientists were determined and worked hard with patience. C.

8、 the scientists were rewarded and got lots of money. D. many other attempts to clone mammals failed.,careful reading,3. The sheep that donated the somatic cell most probably lived _ years. A. 3 B. 6 C. 9 D. 13 4.The word “controversial” in Para 4 probably means _. A. complicated B. arguable C. impor

9、tant D.important,推理判斷,5. Which of the following statements about cloning is NOT true according to the passage? A.Cloning is something that has been developed quite recently. B.Twins that look exactly the same are originally from the same original egg. C.Cloning is used by researchers to develop new

10、plants. D.Animal cloning is much more difficult than plant cloning.,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),6.The writers attitude towards cloning?,Because_,根據(jù)課文內(nèi)容語(yǔ)法填空,Cloning has always been wit

11、h us and is here to stay.Its a way of making an 1.(exactly) copy of another animal or plant.Cloning has two major uses. Firstly,gardeners use it all the time to produce commercial quantities of plants.Secondly, its 2. _(value) for research on new plant species and for medical research on animals.Clo

12、ning animals is a difficult task 3. (undertake). At last the determination and patience of the scientists paid 4. in 1996 with a breakthroughthe cloning of Dolly the sheep.,exact,valuable,to undertake,off,Task3,The fact 5. she seemed to develop normally was very encouraging.Then came the disturbing

13、news that Dolly had become 6.(serious) ill and she only lived six and a half years.Dollys appearance raised a storm of 7. (object) and had a great impact on the media and public imagination.Newspapers wrote of evil leaders hoping to clone 8.(they) to attain their ambitions.Religious leaders raised m

14、oral questions. Now some governments have 9. (forbid) research into human cloning,10. others think cloning is useful for humans.,that,seriously,objections,themselves,forbidden,while/but,Debate,Are you in favor of cloning or against cloning? What is your point of view on it?,Task4,Animal clones may d

15、evelop of older animals.,Use it to produce of plants,Animal clones may lived than the donor animals.,Cloning can be valuable for .,leaders may want to clone themselves.,Religious leaders raised .,Cloning can help save endangered animals.,the illnesses,shorter,Evil,moral questions,commercial quantiti

16、es,Cloning plants can be valuable for research on,new plant species.,medical research on animals,Summary,Cloning not only happens in _, but also in _. Cloning has two _ _. First , it can help gardeners produce_ _ _ _. Second, it is valuable for research on _ _ _and for medical research on _. Cloning

17、 plants is _ while cloning animals is very _.,plants,animals,major uses,commercial,quantities of plants,new,species,animals,straightforward,complicated,plant,3. Cloning became _.Using cloning to _ _ _.,controversial,serious illnesses,cure,Cloning is a way of _ an exact copy of another animal or plan

18、t. 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 the disturbing news that Dolly was ill. _ Dolly lived for