M5U3_Welcome_to_the_unit

Lead-inDoyouthinkthathumanbeingsshouldtrytocontrolnature?Shouldwedoanythingagainstthelawsofnature?Whyorwhynot?Theadvancedtechniqueingenetics(遗传学)withwhichscientistscancreateorcopythingswiththesameDNAiscalled_________.cloneWhatdoyouknowaboutDolly?Dollyanditscreator.“Cloning”isanewbiotechnology(生物技术)whichaimstoproduceanexactcopy(精确复制品）ofananimaloraplantfromitsowncells.Lookatthefollowingpicturesandstudythem.Canyoutellwhatisthemainfeatureofcloning?Dollyistogetherwithhermother.WhatdoyouknowaboutDolly?•theworld’sfirstclonedmammal•createdbyScottishscientistsin1996•sparkedworldwideinterestandconcernafteritsbirth•manycountries,includingGermany,France,Canada,Switzerland,Austria,NorwayandSouthAmerica,havebannedhumancloningsinceDolly’sbirth•diedin2003becauseoflungdiseaseThekitteninthepictureiscalledCC.Itsnameisfrom“Copycat”.ItwasborninDecember2002.TheresearchersinTexasproducedCCwithacelltakenfromhermotherRainbow.CCwasahealthykittenwhogrewintoalivelyaffectionatehousecat.Sheisnottheexactcopyofherclone-motherbecausetheygrewupindifferentsurroundings,thoughtheysharedthesamegenes.Thesefemalepigsarealsocloned.TheywerebornonChristmasDay2001.TheywereNoel,Angel,Star,JoyandMary.Althoughtheyarenotthefirstclonedpigs,theyareactuallythefirsttobeengineeredinawaythattheirorgans(器官）moresuitablefortransplantation移植intohumans.Duetotheshortageofhumanorgansfortransplants,manypeoplearedyingbecausesomeoftheirorgansdonotwork.Itishopedthattheorgansfromthesepigswillbeusedinhuman’sbodies.ThenameofthefirstclonedmonkeyisANDi.Theplayfulcoffee-colouredmonkeywasbornin2000.ThetechnologyisdifferentfromthatusedforDolly.ResearchersinOregon,theUSAcreatedthisfirstgeneticallymodifiedmonkeybyputtingagenefromajellyfish水母,anotherspecies,intosix-day-oldmonkeyembryos.Doyouknowanyotherclonedanimals?Themuleinthepictureistheworld’sfirstclonedmule.ItwasbornonMay42003.HisnameisIdahoGemandhisbrother,Taz,wasaracingmulethathaswonmanycompetitions.thecloneddeerclonedcalvesfromJapanclonedchickenIfcloninggoeswrong,whatwillhappen?Adogoraneagle?Aduckoracrocodile?Alionorakangaroo?Afrogoracrocodile?Abirdoradog?Whatdoyouthinkaboutthefunnypicturesabove?Iscloninggoodorbad?Advantagesofcloning:•curemanygeneticdiseases•savepeople’slives•preventsomeendangeredanimalsfromdyingoutDisadvantagesofcloning:•causeethical道德的，伦理的problems•violate(违背)humanrights•violatethelawsofnature•…Doyouthinkitwouldbeagoodideatoclonehumanssomeday?Whyorwhynot?Ifpossible,doyouwantanotherpersontobeexactlythesameasyou?HomeworkThanksalot!PreviewReading,anddoexercises.①书A、C1、C2、D②讲练通P53-56.