对比观点英语作文

Itoenumerateprosandcons,leteverybodycomment?Leon:1)cloningtechnologycanrelievethosewhocannotbecomethemotherofwomensuffering.2)cloningexperimentstopromotetheimplementationofthegeneticsofdevelopment,forcreatecantheanimalorganstransplantedopenedupaprospect.3)cloningtechnologyalsocanbeusedtotestfetalgeneticdefects.Willbefertilized,usedtodetectvariousgeneticdiseaseclonedembryosanduterus,cloningandgeneticcharacteristicsoffetusdevelopsinexactlythesame.4)cloningtechnologyusedfortreatmentofthenervoussystemdamage.Adultnervoustissueregeneration,butnostemcellscanrepairneurologicaldamage.5)toinvitrofertilizationsurgery,doctorsoftenneedtoconnectmultiplefertilizedimplantedinthewomb,withaintopregnancystagesfromscreening.Butmanywomencanonlyprovideaneggforfertilisation.Throughcloningcanwellsolvetheproblem.Theeggscancloneintomultipleforfertilization,whichgreatlyimprovepregnancyrate.Disadvantages:1)cloningwouldreducethegeneticvariation,throughcloningproducestheindividualhasthesamegenetic,thesamediseasessensitivity,adiseasecoulddestroythegeneratedbycloningofgroups.Canimagine,ifonecountryherdswillhavethesamecloningproduct,alesssevereviruscoulddestroythenationalhusbandry.2)cloningtechnologyusewillmakepeopletendtomultiplytheexistingpopulationofthemostvalueoftheindividual,ratherthanbynaturallawstopromotethewholepopulationofthemuck.Inthissense,thecloningtechnologytointerferewiththenaturalevolutionprocess.3)cloningtechnologyisanexpensivetechnology,needalotofmoneyandbiologicalprofessionalparticipation,failurerateisveryhigh.Dollyis277experimentsonlyresults.Althoughnowdevelopedmoreadvancedtechnology,thesuccessratewasonlytoreach2-3%.4)transgenicanimalsraisedtheriskofinfection.Forexample,ifadrugmilkcowproductioninfectedwithvirus,whichmaybethroughmilkinfectionpatients5)cloningtechnologyappliedtothehumanbodywillleadtotheoffspringofartificialcontrolgenetictraits.Cloningtechnologydebatewhethertoallowthecoreisthedevelopmentofearlyhumanembryosforgeneticoperation.Thisismanyethicistsnotacceptable.6)cloningtechnologycanalsobeusedtocreatesuperman,orhavestrongphysiquebutmentalretardation.Moreover,ifcloningtechnologycaneffectivelyuseamonghumans,menalsolostgeneticsignificance.7)cloningtechnologytotheeffectsoffamilyrelationshipswillalsoishuge.Afather'sDNAcloninggeneratedchildrencanasfather'stwinbrother,onlydelayeddecadeswasbornjust.Itishardtoimaginethat,whenapersonfindyourselfissimplyanotherperson'scompletelyreproductions,he(orshe)whatitfeelsliketobe?Sayso,scienceandtechnologyissometimesadouble-edgedsword,advantagesanddisadvantages,anddon'thavenostandardanswer!Justwatchingpeoplesuchuse!