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1、GeneticallymodifiedfoodsWhatisGeneticallymodifiedfoodsGeneticallymodified(GM)foods arefoodsderivedfrom geneticallymodifiedorganisms.GeneticallymodifiedorganismshavehadspecificchangesintroducedintotheirDNAby geneticengineering techniques.Wecandeveloporgan
2、ismsthatnotnormallyfoundinthespeciesWhyaretransgenicsimportant?Extendedshelf-life（保质期）tomatoHerbicide（除草剂）resistantsoybeanGrowth-enhancedTransgenic(900g)andOrdinary(350g)Catfish（鲶鱼）atthesameageaboutoneyear.Growth-enhancedTransgenic(730g)andOrdinary(15g)S
3、almon（鲑鱼）atthesameageaboutoneyear.GMvegetablesandCookingoilTransgenicAnimalsAdvantagesanddisadvantagesManypeoplethinkthatgeneticallymodified(GM)foodbringpeoplebothadvantagesanddisadvantagesAdvantages1.Bringalotoffoodstopeople2Reducetheamountoflabor3Reduc
4、etheproductioncost,increaseincomeProfessorYuanLongpinghassaidthat，“Peoplearenotmice,wecannotusesomanypeople‘shealthandsafetytodoexperiment,Thefunctionoftransgenicinsect–resistant(抗虫)plantscomefromtoxicproteingene,insectsaredying,butwedonotknowthattoxicpr
5、oteincoulddoharmtoourbodyornot.”Advantages1.Bringalotoffoodstopeople2Reducetheamountoflabor3Reducetheproductioncost,increaseincomeDisadvantagesGeneticallymodifiedfoodsmaydoharmtothehumanbodyTraditionalfoodshavemorenutritionthanGMfoodGMlivingorganismsgrow
6、toofastmaydestroythelocalecosystemProfessorYuanalsosaidthat,“Fromascientificpointofview,theGMisthedirectionofscientificdevelopment.Nowwecantransferthemaize(玉米)genetorice，sothatwecanimprovethephotosynthesis（光合作用）ofrice,thiskindoftransgenictechnologyisvery
7、goodwithoutanyproblems”GMfoodsinChinaGMfoodscontainingfivetypesofrawmaterialsincludesoybean,corn,rapeseed（菜籽油）,cotton,tomatomustbelabeledinChina,manypeoplecanacceptGMfoodsChina’stransgeneresearchprogressesPhytase-containingtransgenicmaizeInsect-resistant
8、transgeniccottonTransgenicriceMypointofviewSciencealwayskeepsdeveloping,soonlywiththerightdirectiononadvancedtechnologycanwegetlotsofdevelopment.Theworldhassomanypepole,needsomuchfoodtoeat,andneeddifferentkindsofmaterials,
