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2019春人教新课标高二英语选修八教案：UNIT2CLONINGWARMINGUPANDPRE-READING.doc

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Unit2CloningPeriod1warmingupandpre-readingTeachinggoals:1.Enablethestudentstoknowwhatiscloning.2.Enablethestudentstoknowwhatarenaturalclonesandman-madeclones.3.Enablethestudentstoknowsomebasicknowledgeaboutcloning.Teachingimportantanddifficultpoints:Enablethestudentstoknowwhatcloningis.Teachingmethods:Speaking,answering,thinking.Teachingaids:AblackboardandacomputerTeachingproceduresStep1Warmingup.Askthestudentstodescribewhatcloningis.Showthestudentsthedefinitionofcloning.3.Inpairs,lookatthesepicturesanddiscusswhichonesarenaturalclonesandwhichonesareman-made.Thinkabouthowtheydiffer.Naturalcloneisonethatoccursfromthe“parent”inanaturalformofcloningwithouthumanhelp.Man-madecloneisonethatproducedthroughhumanintervention(介入)Step2.EnjoyingEnjoysomepicturesofnaturalcloningexamplesandman-madecloningexamples.Step3.Showthestudentshowacloneisproducedbycloningasheep.1.Afemalesheepprovidesaneggcell.Thenucleusisremovedfromtheeggcell.2.Asecondfemalesheepprovidesasomaticcell.Thenucleusisalsotakenout.3.TheeggcellfromsheepAandthenucleusfromsheepBarejoinedtogetherusingelectricity.4.Thecombinedcelldividesandgrowsintoanembryo.5.TheembryoisthenputintofemalesheepC.FinallyasheepDiscloned.Step4.Talkaboutwhatbenefitshumanscangainfromcloning?Step5.Talkaboutwhatproblemsmayarisewhenhumansarecloned?Step6.HomeworkPreviewReading:Cloning;whereisitleadingus?DotheComprehendingonP12ofthetextbook.