人教新课标高二英语Book8 unit2 Cloning warming up 课件.ppt

Cloning:Whereisitleadingus?,Dollythesheep,Itsthemostfamoussheepintheworld.DoyouknowhowDollyisdifferentfromothersheep?,Shewasclonedwhiletheotherswerebornnaturally.Itisthecopyofanothersheep.,man-madeclones,Whatcanyouseeinthepicture?,wecanseeastrawberryplantproducingrunnersinanaturalformofcloning.,naturalclones,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,Whocutthestemofftheplant?Why?,Agardener.Andthegardenerisgoingtoputitintoapottoproduceanewone.Heisactuallymakingacopyoftheplant.,naturalclones,Whatdoyouknowabouttwins?,Therearetwinsofthesamesexandthoseofdifferentsexes.Thetwinshereareidenticalinsexandappearanceandaregoodexamplesofnaturalclones.Theycarrythesamegeneticinformation.Thefertilizedegghassplitintotwowhileinsidethemother,andsoproducedtwoidenticalhumanbabies.,naturalclones,Arethefollowingclonesthesame?Ifnot,whatisthedifference?,NO.Thefirstisman-madeclones,andtherestarenaturalclones.,我国成功繁殖克隆兔体形要比普通兔大许多,第一只克隆宠物猫,克隆马及其“母亲兼姐姐”,克隆的荧光小猪(左)和正常小猪(右),Whatsclone?,Acloneisananimalorplantproducednaturallyorartificiallyfromthecellsofanotheranimalorplantandisexactlythesameasit.,克隆是英语单词clone的音译，clone源于希腊文klon，原意是指幼苗或嫩枝，以无性繁殖或营养繁殖的方式培育植物，如扦插和嫁接。如今，克隆是指生物体通过体细胞进行的无性繁殖，以及由无性繁殖形成的基因型完全相同的后代个体组成的种群。克隆也可以理解为复制、拷贝，就是从原型中产生出同样的复制品，它的外表及遗传基因与原型完全相同。,Naturalcloneisonethatoccursfromthe“parent”inanaturalformofcloningwithouthumanhelp.Man-madecloneisonethatproducedthroughhumanintervention(介入).,Quiz,NaturalcloneMan-madeclone,strawberry,Isitnaturalcloneorman-madeclone?,identicaldogs,NaturalcloneMan-made,cactus,twins,TorFquestions1Cloningmeansmakingacopyofananimalorplant.2Thesheep,namedKittywasthefirstsuccessfulcloneofamammal(哺乳动物).,T,F,3Gardenerscanmakealotofmoneybycloningplants.,T,Dolly,Dolly,4SinceDolley,researchershaveclonedanumberoflargeandsmallanimalsincludinggoats,cows,mice,pigs,cats,rabbitsanddogs.5Aparentcancloneachildwhoisdyingofaterminalillness(不治之症).,T,F,Whatbenefitscanhumansgainfromcloning?,1)Medicalcloningcanhelpcureseriousillnessesthatruinonesqualityoflife(suchasParkinsonsdisease帕金森症orAlzheimersdisease老年痴呆症).2)Itcanhelpinfertilepeoplehavebabies.,Whatproblemsmayarisewhenhumansarecloned?,1)Peoplemaywanttoc