求一篇关于“克隆”的英语10句文!急用!
求一篇关于“克隆”的英语10句文!急用!
求一篇关于“克隆”的英语10句文!急用!
求一篇关于“克隆”的英语10句文!急用!
Cloninginbiologyistheprocessofproducingpopulationsofgenetically-identicalindividualsthatoccursinnaturewhenorganismssuchasbacteria,insectsorplantsreproduceasexually.CloninginbiotechnologyreferstoprocessesusedtocreatecopiesofDNAfragments,cells,ororganisms.Moregenerally,thetermreferstotheproductionofmultiplecopiesofaproductsuchasdigitalmediaorsoftware.Humancloningisthecreationofageneticallyidenticalcopyofanexistingorpreviouslyexistinghuman.Thetermisgenerallyusedtorefertoartificialhumancloning;humanclonesintheformofidenticaltwinsarecommonplace,withtheircloningoccurringduringthenaturalprocessofreproduction.Therearetwocommonlydiscussedtypesofhumancloning:therapeuticcloningandreproductivecloning.Therapeuticcloninginvolvescloningcellsfromanadultforuseinmedicineandisanactiveareaofresearch:whilereproductivecloningwouldinvolvemakingclonedhumanbeings.Suchreproductivecloninghasnotbeenperformedandisillegalinmanycountries.Athirdtypeofcloningcalledreplacementcloningisatheoreticalpossibility,andwouldbeacombinationoftherapeuticandreproductivecloning.Replacementcloningwouldentailthereplacementofanextensivelydamaged,failed,orfailingbodythroughcloningfollowedbywholeorpartialbraintransplant.