Unit-2-Cloning-公开课PPT课件下载推荐.ppt

1、What is a clone?#A clone is an animal or plant produced naturally or artificially（人造人造）from the cells of another animal or plant and is exactly the same as it.cloneNatural cloneMan-made cloneNatural clone is one that occurs in a natural form of cloning without human help.Man-made clone is one that p

2、roduced through human intervention（介入介入）.Look at the following pictures and discuss which ones are natural clones and which ones are man-made.DiscussionA strawberry plantGrowing new plantsTwinsCactus（仙人掌）仙人掌）Natural clonependulum orchid（吊兰吊兰）Dolly the sheepShe was cloned while the others were born n

3、aturally.Dolly was a _ sheep.clonedHow does Dolly differ from other sheep?#Reading Listen to the tape and find out the main idea of each paragraph.Para 1 Para 2Para 3Para 4Para 5B The definition of cloningC The major uses and procedures of cloningA The problems of DollyE The impact of DollyD Peoples

4、 reaction to cloningBCAED定义定义Cloning is a way of making an exact copy of another animal and plant.What is cloning?#It happens both in _ and in_.They can be cloned by _ and _.plantsanimalsthemselveshumansNatural cloneMan-made clonePara 1 The definition of cloning1.How many major uses do cloning have?

5、#Firstly,commercial Secondly,research2.When was the cloning of Dolly the sheep born?#Para 21996The major uses and procedures of cloningAt first,the fact that Dolly developed _ in a natural way was _.Later,the news that she lived for six years,half the length of the life of the _ one was _.Finally,th

6、e problem that occurred to the scientists was that a cloned animal lives_ the original one.Para 3The problems of Dollynormallyencouragingorginalas long as/shorter than/longer thandisturbingshorter thanThe word“controversial”in para 4 probably means _.A.complicated B.arguable C.importantPara 4The imp

7、act of DollyTrue or false:#1 People feared that Cloned Hitler 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 cloningMany governments forbade research into human beings.Which is easier to clo

8、ne,plant or animal?#Because cloning plants is straightforward,but the cloning of animals is very complicated.Thinking 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 cloningBecause_Som

9、e phrases1.pay off 2.cast down 3.have an impact onTwo years of business school really paid off.He has been very much cast down by his failure in the examination.The film had quite an impact on her.What role do the underlined clauses play in the sentences?#（划线部分充当什么句子成分划线部分充当什么句子成分）1.The fact is that

10、 these are both examples of natural clones.2.The fact that she seemed to develop normally was very encouraging.语法专攻语法专攻:#作表语作表语作同位语作同位语3.Then came the disturbing news that Dolly had become seriously ill.4.However,scientists still wonder whether cloning will help or harm us and where it is leading us

11、.作同位语作同位语作宾语作宾语Homework Discuss and translate the procedure of cloning Dolly the sheep into Chinese.A strawberry plantThe new plants that grow from the runners are exact copies of the original plant.一株草莓依靠它沿地一株草莓依靠它沿地“爬走爬走”的匍匐茎的匍匐茎,一一年内就能长出数百株草莓苗年内就能长出数百株草莓苗富贵竹插枝即活富贵竹插枝即活 The gardener should cut the plant,then the cuttings produce another new plant.TwinsThey are born naturally and identical in sex and appearance.Hitler