jortechnologicalbreakthrough,reflectingthedivisionofnucleartechnology,andcontrolofcellculturetechnology.wasoriginallyacloneoftheenglishtransliteration,whichmeanscellsoforganismsthroughtheformationofvegetativepropagationisidenticaltothegenotypecomposedofthedescendantsofindividualstocks,referredtoas"cloning."animalsamajorbreakthroughincloningtechnology,italsobringsawiderangeofdisputes. "cloning"thetermwasintroducedin1903inhorticulture,graduallyappliedbotany,zoologyandmedicineandsoon.broadsenseoftheword"clone"infact,isoftenencounteredindailylife,butdidnotcallit"cloning"only.innature,manyplantshavetheinnateinstinctofcloning,suchassweetpotatoes,potatoes,rosesandotherplantcuttingspropagation.andanimalcloningtechnology,ithasundergonebytheembryoniccellsintosomaticcellsofthedevelopmentprocess. inthespring-the那頭6-year-oldeweswithidenticalgenes,canbedescribedasacopyofitsmother.itisworthnotingthathumancloningtechnologyhasbroughtenormousbenefitsinthesametime,willbringdisastertohumanbeingsandproblems,butwecannotbecausethetechnologycouldhaveseriousconsequencesandtopreventitsdevelopment,itsmajorbenefitarisingfromthefinalanalysis,thedisadvantages,itwillbewidelyusedinregardtothebenefitofhumanity.anindividual(usuallythroughthecarrier),furtherstudyoruse.sometimesreferstothesuccessofcloningtoidentifya-(a|zh-cn:phenotype;zh-tw:dominant)-ofthegene.therefore,whenbiologistssayacertaindiseasegeneshavebeenclonedsuccessfully,thatisthelocationofthisgenehavebeenidentifiedanddnasequence.obtainedcopiesofthegenecanbeidentifiedthatisaby-productofthisgene. cloninganorganismmeanstocreateanoriginalorganismandhasexactlythesamegeneticinformationoftheneworganisms.inthecontextofmodernbiology,whichusuallyincludesomaticcellnucleartransfer.insomaticcellnucleartransfer,theoocytenucleushasbeenremoved,replacedbythecloningoforganismsfromthenucleusoutofcells,usuallyoocyteanditsnucleusshouldbemovedfromthesamespecies.asthenucleuscontainsalmostallthegeneticinformationoflife,hosttothedevelopmentofoocytesintonucleargeneticdonorwiththesameorganism.althoughmitochondrialdnahasnotbeentransplantedhere,butmitochondrialdnaisstillrelativelysmall,usuallynegligibleimpactonorganisms. cloneinhorticultureisthroughnutritionalmeanshaveasingleplantreproductivefuturegenerations.cloningalotofplantsthroughasexualreproductionsuchasplantsfromasingleindividualtoobtainalargenumberofoffspring. theuseofcloningtechnologytosaverareandendangeredanimals,theexpansionofanimalbreedinggroups,theprovisionofexperimentalanimalsinsufficientquantitiestopromotethestudyoftransgenicanimals,captureofgeneticdiseases,thedevelopmentofahighlevelofnewdrugs,theproductionoforgansforhumantransplantorgans,suchastheroleofresearch,however,ifitsapplicationinhumanreproductiononitsown,willhaveahugecrisisofethics. whatchina'scloning? frog:in1952,wasnotsuccessful. lei:1963,chinesescientiststongdizhouearlyin1963byamalecarpcarpgeneticmaterialinjectedintotheeggsoffemalestosuccessfullycloneafemalecarp,thanthecloningofdollythesheepasearlyas33years.however,becausetherelevantpapersarepublishedinachinesescientificjournal,hasnottranslatedintoenglish,itisnotknowninternationally. [editthisparagraph]thenewperiod,fruitsofchina'scloningtechnology asthenewcentury,cutting-edgescience,cloningtechnologyfromthemomentofitsbirthsinceattractedtheattentionoftheworld.astheworld'slargestdevelopingcountry,chinahasbeencommittedtotheforefrontofscientificresearch.accordingtothecurrentsituation,thecloningoftheemergingtechnologyinchinahasbeenunprecedentedattentionandfruitful: 1,2000injune16,fromthenorthwestagricultureandforestryuniversityofscienceandtechnologyofanimalembryoengineeringexpertprofessorzhangyongcultivatedtheworld'sfirstgoatadultsomaticcellcloning,"yuanyuan"breedingfarminthesmoothbirthoftheschool."yuanyuan"asaresultofdefectsinlungdevelopment,onlysurvivedfor36hours.june22thesameyear,secondonlytosomaticcellsofgoat"yangyang"inthenorthwestagricultureandforestryuniversityofscienceandtechnologywasborn.august8,2001,"yang-yang"inthenorthwestagricultureandforestryuniversityofscienceandtechnologybirthof"龍鳳胎",meaningthatthefirstgenerationofclonedsheepbreedingnormalcapacity. accordingtothebriefing,february26,2003,clonedsheep"yangyang"daughter"慶慶"birthtodaughter"sweet",february6,2004"sweet"smoothbirthtoherdaughter,"smiled.""yangyang"familyfourgenerationstoachieve.thisisnotonlythefirstgenerationofclonedsheepwithreproductivecapacity,theirdescendantsstillhavenormalfertility.atpresent,the"yang-yang"andherdaughter"慶慶"granddaughter"sweet"andthegreatgranddaughter"慶慶"freetolivetogether.bytheendofmay2004,allvisitorshavemorethanonemillionpeople 2,notlongago,intheagriculturaluniversityofhebei,shandongacademyofagriculturalsciencesandbiotechnologyresearchcenter,ajointresearch,china'sscientificandtechnicalpersonnelthr << 上一页 [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] ... 下一页 >>
|
|