人教版英语选修8 Unit2 Cloning--Period1VIP专享VIP免费

Unit2CloningPeriod1Asamplelessonplanforreading(CLONING：WHEREISITLEADINGUS?)IntroductionInthisperiod,afterthewarmingup,studentswillfirstbeguidedtopre-readthetextbyquestioningandanswering.Thentheyshallreadaloudtotherecording,readforforms,readforthetypeofwritingandsummaryofCLONING：WHEREISITLEADINGUS?.Thestudentswillbeaskedtocopyusefulexpressionsandmakesentences,readandtransformandreadthetextagaintodrawadiagramofitandretellthestorywithyourownwords.TheperiodwillendinstudentslearningmoreaboutDolly.ObjectivesTohelpstudentsunderstandthetext’sformsandcontentsandlearnaboutcloningTohelpstudentscommunicateonthetopicinfocuswiththewords,expressionsandstructureslearnedinthisunitFocusWordsclone，differ，undertake，cast，forbid，accumulate，retire，bother，resist，restore，obtainCollocationsobjectto，infavourof，payoffPatterns1.Italsohappensinanimalswhentwinsidenticalinsexandappearanceareproducedfromthesameoriginalegg.2.Firstly,gardenersuseitallthetimetoproducecommercialquantitiesofplants.3.ThencamethedisturbingnewsthatDollyhadbecomeseriouslyill.4．Thequestionthatoccurredtothescientistswas：“Wouldthisbeamajordifficultyforallclonedanimals？”5．Newspaperstoldstoriesofevilleadershopingto用心爱心专心clonethemselvesandreligiousleadersraisedmoralquestions.AidsMultimediafacilities,tape-recorder,photos,diagramsProcedures1.Warmingupbyleaningtheword“clone”ScientistinScotlandgrows"impossible"sheepfromonecellofanothersheep.clonen.1.Acell,groupofcells,ororganismthatisdescendedfromandgeneticallyidenticaltoasinglecommonancestor,suchasabacterialcolonywhosemembersarosefromasingleoriginalcell.2.Anorganismdescendedasexuallyfromasingleancestor,suchasaplantproducedbylayeringorapolypproducedbybudding.3.ADNAsequence,suchasagene,thatistransferredfromoneorganismtoanotherandreplicatedbygeneticengineeringtechniques.4.Onethatcopiesorcloselyresemblesanother,asinappearanceorfunction:"filledwithbusiness-schoolclonesingrayandbluesuits"MichaelM.Thomas.v.cloned,clon·ing,clones1.Tomakemultipleidenticalcopiesof(aDNAsequence).2.Tocreateorpropagate(anorganism)fromaclonecell:cloneasheep.3.Toreproduceorpropagateasexually:cloneaplantvariety.4.Toproduceacopyof;imitateclosely:"Thelookhasbeenclonedintocliché"CathleenMcGuigan.2.Pre-readingbyquestioningandansweringWhatiscloning?Wedefinecloningasproductionofacellororganismwiththesamenucleargenomeasanothercellororganism.Cloningistheprocessofcreatinganidenticalcopyofanoriginal.Acloneinthebiologicalsense,therefore,isasinglecell(likebacteria,lymphocytesetc.)ormulti-cellularorganismthatisgeneticallyidenticaltoanotherlivingorganism.Sometimesthiscanreferto"natural"clonesmadeeitherwhenanorganismreproduces用心爱心专心asexuallyorwhentwogeneticallyidenticalindividualsareproducedbyaccident(aswithidenticaltwins),butincommonparlancethecloneisanidenticalcopybysomeconsciousdesign.Alsoseeclone(genetics).ThetermcloneisderivedfromtheGreekwordfor"twig".Inhorticulture,thespellingclonwasuseduntilthetwentiethcentury;thefinalecameintousetoindicatethevowelisa"longo"insteadofa"shorto".Sincethetermenteredthepopularlexiconinamoregeneralcontext,thespellingclonehasbeenusedexclusively.3.ReadingaloudtotherecordingWholelanguageteachersaffirmthatreadingaloudteachesyouthestudentsaboutlanguageinawaythatsilentorindependentreadingnevercan.Readingaloudtothetapehelpsyouthestudentsdevelopandimprovelanguageskills--...