e"therapeuticcloning"willbeintheproductionoforgansfortransplantandtocaptureaspectsofthedisease,suchasaccesstoabreakthroughinbiotechnologyandmedicinetobringaboutrevolutionarychangesintechnology.forexample,whenyourdaughterneedsabonemarrowtransplantandnoonecanprovideforher;whenyouareunfortunateenoughtolosethe5-year-oldchildandcannotescapethepain;whenyouwanttoraisetheirchildrenareunabletobirth......maybeyouwillbeabletounderstandthecloninggreatscientificvalueandpracticalsignificance.therapeuticcloningresearchandhumancloningexperimentintegritybetweenthecomplementaryandmutuallyreinforcing,andtherapeuticcloningastheendpointistheemergenceofacompletehumancloning,iftherighttouse,theyallcanandshouldbebroughttohumansocietytothegospel. sciencehasalwaysbeenadouble-edgedsword.however,ascientificandtechnologicalprogressisreallybeneficialtohumans,thekeyliesinhowtodealwithhumanbeingsanduseit,notbecauseofthetimebeingunreasonableonthe因噎廢食.cloningtechnologyandnucleartechnologymayindeed,ascanthebenefitofmankind,butalsoharmfuleffects.ontheonehand,itcanbringmanybenefitstomankind.suchastomaintainagoodspecies,saveendangeredanimals,animalcloningusingthesamegeneticbackground,suchasbiomedicalresearch;ontheotherhand,itwillchallengeonbiodiversity.biologicaldiversityistheresultofnaturalevolution,butalsothedrivingforceofevolution,sexualreproductionisimportanttoformthebasisofbiologicaldiversity,and"clonedanimals"willresultinreducedbiologicalstrains,decreasedtheviabilityoftheindividual. assoonaspeopleworryaboutcloningtechnologymatures,therewillbebadintentionswereclonedhundredsof"hitler",oranothercelebritycloningtocreateconfusion,itisamisunderstandingofcloning.humancloningisbeingcopiedgeneticcharacteristics,andacquiredbymanyfactorsaffecttheenvironmentofthinking,personalityandothersocialattributescannotbeexactlythesame,thatis,nomatterhowthedevelopmentofcloningtechnology,humancloningcanonlyphysical,butnotthesoulofhumancloningmoreover,humancloningandthecloningofhumanbeingshavetheagegap.therefore,theso-calledhumancloningisnotthefullcopy,historicalfigureswillnotrevive,therealitypeopledonothavetoworryaboutmorethana"self"to. [editthisparagraph]ofallgoodsandcloningcloningtime sheep:1996,victoria(dolly) monkeys:injanuary2000,tetra,female pig:inmarch2000,fivepigletspplscotland;inaugust,xena,female cow:in2001,alphaandbeta,male cat:theendof2001,copycat(cc),female rat:2002 rabbit:2003,march-aprilinfranceandnorthkoreaweretoachieveindependence; mule:inmay2003,idahogem,male;june,utahpioneer,male lu:2003,dewey ma:2003,prometea,female dog:in2005,thekoreanteamatseoulnationaluniversityexperiment,snoopy(snoopy) pig:august8,2005,thefirstforthefirstsomaticcellclonedpig althoughcloninghasmadeconsiderableprogress,thecurrentsuccessrateofcloningisstillverylow:dollywasbornbeforetheresearchersexperienceda276failedattempts;of70calveswerebornin9000afterattemptstobesuccessful,andone-thirdofthematanearlyagehaddied;prometeaalsotook328attemptsbeforeasuccessfulbirth.forsomespecies,suchascatsandgorillas,thereisnoreportsofsuccessfulcloning.thedogcloningexperimentshavealsobeenrepeatedhundredsoftimesandthentesttheresultsobtained. dollywasbornafterthetestingshowedthatagewasbornwhenitsolder.whenher6-year-oldwouldhaveonlyageneralold-agearthritis.thisisconsideredtheagingofthewearandtearcausedbytelomere.telomereislocatedattheendofchromosomes.withcelldivision,telomeresinthereplicationprocessofcontinuouswear,whichisusuallyconsideredtobeoneofthereasonsforaging.however,theresearcherssucceededincloningcattleonlytofindthattheyareactuallyyounger.analysisoftheirtelomeresthattheynotonlyreturnedtothebirthlength,andtimeofbirththantheaveragetelomerelonger.thismeansthattheycanbeefthantheaveragehavealongerlife,butduetoexcessivegrowth,manyofthemdiedprematurely.theresearchersbelievethattheresearchcouldeventuallybeusedtochangehumanlife. [editthisparagraph]humancloningincompatiblewithhumanlifeethics modernscienceandtechnology,especiallyinscienceandtechnologyofmodernlife,weshouldnotrespecttheprinciplesofethics,weshouldnotlistentothevoiceofethics?expertsforscientificmadmansecrethumancloningintheunitedstatespointedoutthatthepracticeofhumancloning──contrarytotheethicsofhumanlife,thereisagreatdealofcontroversyanddifficulttosolveaseriesoflegalproblems. china'smediaarereproducedintheforeignmediarecentlyreportedasurprisingsource:agroupofmanipulationbythecultofscienceandlunatics,theunitedstatesnevadadeserttothedepthsofasecrethumancloningexperiment.accordingtobritishscientistswhocreatetheworld'sfirstclonedsheep"dolly"thesameprinciple,fromonewhodiedinfebruarythisyear,the10-month-oldbabyhadextractedtheunitedstatestocreateclonedhumancells.itissaidthat"ifeverythinggoessmoothly,theworld'sfirstclonedhumanwillbeborntheendofnextyear." afterthedisclosureofinformation,cloningtechnologyanditsethicalissuesbroughtaboutbythepeopleonceagainbecomeahotdebate.ifthisnewsistrue,howthemattershouldbe,how << 上一页 [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] ... 下一页 >>
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