高中英语 选修八 2.7《Unit 2　warming-up》课件 .ppt

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1、新课标人教版课件系列《高中英语》选修(模块）8-2.7Unit2CloningwarmingupandspeakingDoyouenjoywatchingTVseries?HaveyoueverseenJourneyToTheWest?Whatisclone?CloneClone,alsocalledreproduceasexually(无性生殖/繁殖),isthecreationofcellsorwholeanimalsusingDNAfromasingle“parent”,withoutusingthenormalreproductive(有性生殖)proce

2、ss.TheclonehasthesameDNAtotheparent.What'sclone?cloneNaturalcloneMan-madecloneNaturalcloneisonethatoccursfromthe“parent”inanaturalformofcloningwithouthumanhelp.Man-madecloneisonethatproducedthroughhumanintervention(介入).cactusstrawberrytwinspendulumorchid(吊兰)naturalcloningexamplesMan-m

3、adecloningexamplestheimportanteventsincloninghistoryIn5000B.C.(谷物选种)HumanBeingsbegantochoosethebestseedsfromsomekindsofcrops.Thatwasthebeginningofcontrollinglifeaccordingtohuman’swill.In1952:Cloningtadpole(克隆蝌蚪)TheAmericanscientistscreatedacopyoftadpolebymeansofusingatadpolecell.Thist

4、inytadpolehasbecomethefirstkindofcloninganimal.In1978:Thefirstcaseoftubeinfant(试管婴儿)appeared.☆ABritishdoctorusedthesperm（精液）ofamanandfertilized(受精)itinatesttube(试管).☆Thentransplanted(移植)theembryo(胚胎)intothewomb(子宫)ofahealthymother.☆ThefirsttubeinfantcalledLouisappeared.In1996,thefamou

5、ssheep“Dolley”wasclonedsuccessfullyDolleyandtheFatherofDolley–Lanwilmut(伊恩.威尔姆)In1998Aseriesofthingswerecloned.ThescientistsinHawaiiUniversityclonedover50mice.Someprivateinstitutions(协会)successfullyclonedlittleoxen.In2002,thescientistsofA&MUniversityinUSAhasbredthefirstclonedcatinthew

6、orld.Nowadays:☆Cloneddog,mouse,rabbit,goat,ox,pigappeared.☆Chinabecometheseventhcountrythathastheabilitytoclonepigs.☆Chinahassucceededinusingembryonic（胚胎的）celltoclonemanyanimals.TheEndThankyou!QuizNaturalcloneMan-madeclonestrawberry★★Isitnaturalcloneorman-madeclone?identicaldogsNatura

7、lcloneMan-made★cactus★twinsTorFquestions1Clonecanbefrombothnaturalcloneandman-madeclone.2Thesheep,namedKittywasthefirstsuccessfulcloneofamammal(哺乳动物).TF3Onlystrawberriesandcactus(仙人掌)arenaturalclones.F4SinceDolley,researcherhaveclonedanumberoflargeandsmallanimalsincludinggoats,cows,mi

8、ce,pi