选修八unit2reading培训资料.ppt

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1、选修八unit2readingnaturalcloneman-madeclonecloneNaturalcloneisonethatoccursfromthe“parent”inanaturalformofcloningwithouthumanhelp.Man-madecloneisonethatproducedthroughhumanintervention(介入).cactuspendulumorchid(吊兰)naturalcloningexamplesstrawberrytwinsnaturalcloningexamplesma

2、n-madecloningexamplesthefirstclonedcatDollythesheepIn1996,asheepcalledDollywasborn.Itisthefirstmammaltobecloned.Itisconsideredtobethegreatestsuccessinthedevelopmentofcloning.Man-madecloneShewasclonedwhiletheotherswerebornnaturally.ReadingTask1Readthepassageandfindoutthem

3、ainideaofeachparagraphPara.1Para.2Para.3Para.4Para.5Cloningisawayofmakinganexactcopyofanotheranimalandplant.Cloninghastwomajoruses.TheproblemsofDolly.TheeffectofDollyItisforbiddentoclonehumanbeing.ReadingTask2DetailedReadingReadtheparagraph2andanswerthetwoquestions.Whata

4、rethetwomajorusesofcloning?Whyisiteasiertomakecommercialplantclonesthananimalclones?Firstly,gardenersuseitallthetimetoproducecommercialquantitiesofplants.Secondly,itisvaluableforresearchonnewplantspeciesandformedicalresearchonanimals.Cloningplantsisstraightforwardwhilecl

5、oninganimalsisverycomplicatedReadingTask3Readthe9sentencesbelowthepictureandgetfamiliarwiththeprocedureofcloningEnjoythevideoFourfemalesheepparticipateinthecloningofanewsheep.Electricityisneededintheprocedure.SheepBprovidesasomaticcellfortheclone.Thelambistheexactcopyoft

6、hesheepwhichprovideseggcell.FTFTTheprocedureofcloningDollythesheepReadingTask4Readparagraph3,trytogetsomeinformationaboutDollythesheepafteryourreading,thenanswerthequestionsonthescreenwithyourbookclosed1.Whatwasthefirstclonefromanadultanimal?2.Atwhatagedidthisclonedie?3.

7、Didshedeveloptheillnessofolderanimals?4.Whichonecanlivelonger,cloneonesorordinaryones?DollythesheepShewassixandahalfyearsoldYes,shebecameserioulyill.Ordinaryones.Gothroughparagraphfourandfive,trytofindouttheadvantagesanddisadvantagesofcloningComprehendingAdvantagesusingc

8、loningtocureseriousillnesseshelpsaveendangeredanimalsproduceplantsofsimilarqualityforsalecloningplantsc