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1、Cloning Where is it Leading usReading Where is it leading us?Where is it leading us?Book 8 unit 2 is one that occurs in a natural form of cloning without human help.is one that is produced through human intervention(介入介入).Warming upTwo kinds of clones:Natural cloneMan-made cloneIn pairs,look at thes
2、e pictures and discuss which ones are natural clones and which ones are man-made.Explain how they differ.discussionA strawberry plantThe new plants that grow from the runners are exact copies of the original plant.富贵竹插枝即活富贵竹插枝即活 The gardener cuts the plant,and then the cutting produces another new p
3、lant.富贵竹插枝即活富贵竹插枝即活仙人掌每块落地就生根仙人掌每块落地就生根TwinsThey are born naturally and identical in sex and appearance.Dolly是世界上第是世界上第一例用体细胞一例用体细胞乳乳腺上皮细胞腺上皮细胞,通过通过细胞核移植技术细胞核移植技术,在复杂的人工操在复杂的人工操作下作下,得到的一只得到的一只小绵羊小绵羊。She was cloned while the others were born naturally.Dolly was a _ sheep.clonedHow does Dolly differ f
4、rom other sheep?In 1996,a sheep called Dolly was born.It is the first mammal to be cloned.It is considered to be the greatest success in the development of cloning.The following are some photos about cloning.See how much you know about it.2001 cloning cattle2003 Cloning horse2002cloning rabbits2002
5、cloning cats2005 cloning dogs克隆的荧光小猪克隆的荧光小猪(左左)和正和正常小猪常小猪(右右)In pairs discuss what you understand about cloning.Then list the questions you want to find out.Share your lists with one another.Pre-readingQuestions about cloning1.What is a clone?A clone is group of cells or organisms that are genetical
6、ly identical and have been produced asexually(无性生殖无性生殖/繁繁殖殖)from the same original cell.They include natural and man-made clones.Clone,also called reproduce asexually(无性生殖无性生殖/繁殖繁殖),is the creation of cells or whole animals using DNA from a single“parent”,without using the normal reproductive(有性生殖有性
7、生殖)process.The clone has the exactly same DNA to the parent.It includes natural and man-made clone.2.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 clonin
8、g of animals is more complicated.It was not achieved until 1996 and is fully explained in the first reading.3.What benefits can humans gain from cloning?1)Medical cloning can help cure serious illnesses that ruin ones quality of life(such as Parkinsons disease帕金森症帕金森症 or Alzheimers disease老年痴呆症老年痴呆症
9、).2)It can help infertile people have babies.4.What problems may arise when humans are cloned?1)People may want to clone themselves so they can live forever.2)People may want to clone dead children.3)People may want to clone their favorite pets.Skimming Please read the passage quickly Please read th
10、e passage quickly and get the main idea,and then and get the main idea,and then finish the following exercises in finish the following exercises in groups.groups.1.The main idea of the text is_ 2.A.animal cloning is very valuable and can benefit the world.3.B.animal cloning could be misused by bad p
11、eople 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.主旨大意主旨大意2.The cloning of Dolly the sheep succeeded because_.A.its easier to clone a sheep than other animals B.the scientis
12、ts were determined and worked hard with patience C.the scientists were rewarded and got lots of money D.many other attempts to clone mammals failedB细枝末节细枝末节3.What is peoples fear about human cloning.Which of the following is wrong?A.Cloned Hitlers would do harm to the world.B.Cloned people may be ki
13、lled at will for medical aid.C.A woman would have difficulty recognizing her real husband.D.Men will die out because a woman can give birth to a baby without a husband.4.The sheep that donated the somatic cell most probably lived _ years.A.3 B.6 C.9 D.13推理判断推理判断5.We can infer from the last three par
14、agraphs 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.There were arguments about animal cloning and concerns about the future of cloning.D.Dolly successfully cloned a new lamb with the help
15、of cloning scientists.Reading Listen to the tape and find out the main idea of each paragraph.The main idea of each paragraph.a way of making an exact copy of another animal and plant.problemstwo majoreffect1.Cloning is _2.Cloning has _ uses.3.The _ of Dolly.4.The _ of Dolly.5.Peoples to cloning.rea
16、ctionCloning 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 cloning Firstly,commercial Secondly,researchPara 2The major uses and p
17、rocedures of cloningIn this paragraph,the word“straightforward”means _.A.uncomplicated B.honest C.frank D.difficultDo you know about:the procedure works of a sheep?克克隆隆羊羊诞诞生生图图示示 “多利多利”的诞生标志着克隆研究的诞生标志着克隆研究取得新的进展和重大突破取得新的进展和重大突破,而且这个结而且这个结果证明果证明:动物体中执行特殊功能动物体中执行特殊功能,具有具有特定形态的所谓高度分化的细胞与受特定形态的所谓高度分化的细胞
18、与受精卵一样具有发育成完整个体的潜在精卵一样具有发育成完整个体的潜在能力。也就是说能力。也就是说,动物细胞与植物细胞动物细胞与植物细胞一样一样,也具有全能性也具有全能性.“多利多利”的诞生有什么重大的意义和影响？的诞生有什么重大的意义和影响？At first,the fact that Dolly developed _ in a natural way was _.Later,the news _Dolly had become seriously ill was _.Finally,the problem that occurred to the scientists was that a
19、 cloned animal lives_ the original one.Para 3The problems of Dollynormallyencouragingthatas long as/shorter than/longer thandisturbingshorter thanThe word“controversial”in Para 4 probably means:_.A.complicated B.arguable C.important D.traditionalPara 4The impact of DollyIts appearance raised and the
20、 media and public imagination.a storm of objectionshad a great impact onTrue or false:1People feared that Cloned 2Hitlers 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 governmen
21、ts forbade research into human beings.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_ Detail reading Fill in the chart using the information from the text.Problems or d
22、angers of cloningAdvantages of cloningAnimals may_ _ of older animals.Medical cloning could _ _ for serious degenerative(变变质的）质的）_ in humans.developthe illnessesproduce curesillnessesAnimal clones may _ _ than the donor animalsCloning plants can _ _ of similar _ _ _._ _ may want to clone themselves.
23、Cloning plants can be _ for research on _.There are _ _ to cloning human beings.Cloning can help save _ _.die youngerproduce plantsqualityforsaleEvil leaderusefulnew plant species moral objectionsendangered animalsFind the main idea of each paragraph.Cloning is a way of making an exact copy of anoth
24、er animal and plant.Cloning has two major uses.The problems of Dolly.The effect of Dolly.It is forbidden to clone human beings.Para 1.Para 2.Para 3.Para 4.Para 5.Fill in the chart about the advantages and disadvantages of cloning.Advantage(good points)Disadvantage(bad points)Collecting information C
25、loning is beneficial toIt can make more profits forWe could use cloning to cureCloning can help saveCloning can provide a copy of a child for a couple Animals clones get ill andAgainst natureAnimals clones may develop the illness ofEvil leaders may want toPeople are afraid that scientists will creat
26、e thousands of copies of the same person.gardeners and farmersendangered animalswhose child has dieddie youngolder animalsclone themselvesillnesshumansPractice activity:Debate Are you in favor of cloning or against cloning?State your point of view on it.For Against Cloning is valuable for _ research
27、 on animals.medicalAdvantages of cloning Medical cloning could produce _for serious illnesses in humans.cures Cloning plants can produce large _ of plants for _.quantities Cloning plants can be useful for research on _ _ _.speciesplantsalenewProblems of cloning Animal clones may develop the _ of old
28、er animals Animal clones may die _ than the original animals._ _may want to clone themselves.There are_ _ to cloning human beings.illnessesyoungerEvil leaders moral objectionsWe can conclude _A.Cloning is good for us.B.Cloning has two aspects.C.If cloning is used in a correct way it can bring many c
29、onvenience to us.D.If cloning is used in an evil way it can cause much trouble.We should use cloning in a wise way!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.Homework Finish off Ex.1,2,3 on Page13.