选修8-Unit2《Cloning》课件-Warming-up&-Reading-新人教版[1]-2.ppt

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1、ReadingCloning:WhereisitLeadingus?cloningReadingWhereisitleadingus?Book8unit2isonethatoccursinanaturalformofcloningwithouthumanhelp.isonethatisproducedthroughhumanintervention(介入).WarmingupTwokindsofclones:NaturalcloneMan-madecloneInpairs,lookatthesepicturesanddiscusswhichonesarenaturalclones

2、andwhichonesareman-made.Explainhowtheydiffer.discussionAstrawberryplantThenewplantsthatgrowfromtherunnersareexactcopiesoftheoriginalplant.Naturalclone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AstrawberryplantTheplantproducesitsownrunners.GrowingnewplantsMan-madecloneAstemTakecuttingsfromgrowingplantstom

3、akenewones.富贵竹插枝即活Thegardenercutstheplant,andthenthecuttingproducesanothernewplant.Man-madeclone富贵竹插枝即活仙人掌每块落地就生根TwinsTheyarebornnaturallyandidenticalinsexandappearance.NaturalcloneDolly是世界上第一例用体细胞─乳腺上皮细胞,通过细胞核移植技术,在复杂的人工操作下,得到的一只小绵羊。Shewasclonedwhiletheotherswerebornnaturally.Dollywasa______

4、sheep.clonedHowdoesDollydifferfromothersheep?Man-madecloneIn1996,asheepcalledDollywasborn.Itisthefirstmammaltobecloned.Itisconsideredtobethegreatestsuccessinthedevelopmentofcloning.Thefollowingaresomephotosaboutcloning.Seehowmuchyouknowaboutit.2001cloningcattle2003Cloninghorsecloningrabbits20

5、02cloningcats2005cloningdogs克隆的荧光小猪(左)和正常小猪(右)Inpairsdiscusswhatyouunderstandaboutcloning.Thenlistthequestionsyouwanttofindout.Shareyourlistswithoneanother.Pre-readingQuestionsaboutcloning1.Whatisaclone?Acloneisgroupofcellsororganismsthataregeneticallyidenticalandhavebeenproducedasexually(无性生

6、殖/繁殖)fromthesameoriginalcell.Theyincludenaturalandman-madeclones.Clone,alsocalledreproduceasexually(无性生殖/繁殖),isthecreationofcellsorwholeanimalsusingDNAfromasingle“parent”,withoutusingthenormalreproductive(有性生殖)process.TheclonehastheexactlysameDNAtotheparent.Itincludesnaturalandman-madeclone.2

7、.Howisacloneproduced?Thecloningofplantsissimpleandrelativelyeasy.Itcanbedonebytakingcuttings(man-madecloning)orlettingtheplantproduceitsownrunners(naturalcloning).Thecloningofanimalsismorecomplicated.Itwasnotachieveduntil1996andisfullyexplain