新视野大学英语(第二版)听说教程第三册听力原文

Iandeveryoneelseare99.9%identical.\rM1:Right,andthetwinsthatwearelookingatout,especiallytheguyswiththefunnyhatson,\rhowidentical,how...howmuchthesamearethey?\rM2:Well,dependsonwhethertheyarematernaltwinsorfraternaltwins.Maternaltwinsare\r100%identical.\rM1:Theseguys?\rM2:Theseguys,100%identical.Er,that'sbecauseaftertheegghasbeenfertilized,itsplits\randdivides,sotheyactuallysharethesamegeneticmaterialfor,forveryeariystages.\rM1:Asaresearcher,whatkindofinformationdoesthattellyou,whatisthe,well,howisthat\rhelpfultoyou?\rM2:Sotwinstudiesareactuallyveryhelpfulintermsoftryingtohelpidentifyandlocalize\rgenesthatcausedisease.(Right)Manydiseases,notalldiseaseshaveagenetic\rcomponent.(Right)Andsomediseaseshaveageneticcomponentaswellasan\renvironmentalcomponent.\rM1:Sure,sure,sure.\r\r2011915