选修八第二单元课件 Cloning.ppt

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1、cloningUnit2Learningaims:*Tohaveagoodunderstandingofthereadingpassage;*Tobeabletodiscusssomeoftheissuesassociatedwithcloning.DollythesheepDollywasclonedwhiletheotherswerebornnaturally.HowdoesDollydifferfromothersheep?man-madecloneNaturalcloneisonethatoccursinanaturalformofcloningwitho

2、uthumanhelp.Man-madecloneisonethatisproducedthroughhumanintervention(介入).Lookatthefollowingpicturesanddiscusswhichonesarenaturalclonesandwhichonesareman-madeclones.DiscussionNaturalorman-madeclones?一株草莓依靠它沿地“爬走”的匍匐茎,一年内就能长出数百株草莓苗。NaturalcloneAstrawberryplantGrowingnewplantsman-madeclone

3、NaturalcloneTwinsDoyouwanttoknow:Whatisaclone?Howisacloneisproduced?Whatbenefitscanhumangainfromcloning?Whatproblemsmayarisewhenhumansarecloned?Reading:cloning:whereisitleadingus?1.Scanthefollowingpassageandmatchtheparagraphwiththecorrectsentence.Para1A.TheproblemsofDollyPara2B.Thetwoma

4、jorusesandproceduresofcloningPara3C.TheimpactofcloningDollyPara4D.ThedefinitionofcloningPara5E.People’sreactiontocloningFast-reading(5minutes)2.Themainideaofthetextis______.A.Animalcloningisveryvaluableandcanbenefittheworld.B.Animalcloningcouldbemisusedbybadpeoplesoitmustbeforbidden.C.A

5、nimalcloningiswelldevelopedbecauseDollythesheepwasborn.D.Animalcloningraisedargumentsandscientistsarenotsureaboutitsfuture.Fast-readingCareful-readingTask1:（para1-2)(3minutes)1.Whatiscloning?2.Whatarethetwomajorusesofcloning?3.Whyisiteasiertomakecommercialplantclonesthananimalclones?Car

6、eful-readingTask1:（para1-2)Whatiscloning?Cloningisawayofmakinganexactcopyofanotheranimalorplant.Careful-readingTask1:（para1-2)2.Whatarethetwomajorusesofcloning?Thefirstuseistoproducecommercialquantitiesofplants.Thesecondistoresearchonnewplantsspeciesanddomedicalresearchonanimals.Careful

7、-readingTask1:（para1-2)3.Whyisiteasiertomakecommercialplantclonesthananimalclones?Becausecloningplantsisstraightforwardwhilecloninganimalsisverycomplicated.Careful-readingTask2:（para3-5)(4minutes)1.Itcanbeinferredfromthepassagethataclonedanimal_____.usuallylivesaslongastheorigi