新人教版选修八 unit 2 cloning-using language[课件]

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1、Unit2cloningusinglanguageTheReturnoftheDinosaurs?Answerthefollowingquestions:1.HaveyoueverseenthefilmJurassicPark?Dopeoplelikethisfilm?Whatanimalsdoyouseeinthefilm?Aretheyrealdinosaurs?Warmingup(4ms)2.Doyoulikedinosaurs?Canyouseetheminourreallife?Why?Warmingup(4ms)3.Doyouthinkitispossibleto

2、clonedinosaurs?Ifnot,why?Ifyes,doyouthinkthat’sgoodforhumanbeings?Why?Warmingup(4ms)Readthetext,thentellthefollowingsentencesaretrueorfalse.(Studentscandiscussinpairs.)Scientistsarestillexperimentingwithcloningmammalsbecausetheythinkitcanmakemoney.Theanimalsthathavedisappearedfromtheearth,l

3、ikedinosaurs,canbebroughtbacktolifethroughcloning.Ifwecancloneanyextinctanimals,weshouldletthemliveinazoo.FFFReading--Iscanning(5ms)GivesomereasonswhyitiseitherimpossibleorunsuitabletocloneextinctanimalsReason1:Reason2:Reason3:YouneedperfectDNTThereisnotenoughdiversityforclonedanimalstoover

4、comenewdiseases.Itwouldbeunfairtocloneanyextinctanimalsiftheywouldhavetoliveinazoo.AdvantageofdiversityDisadvantageofdiversityDiversityinagroupofclonedanimalsIfthereisanewillnesssomeoftheseanimalsmaydie,butotherswillsurviveandpassedontheabilitytoresistthatdiseasetotheirchildren.Theywouldall

5、havethesamearrangementofgenesandsotheymightalldieofthesamedisease.Reading--IIDetailreading(6ms)Readthetext,thenanswerthefollowingquestions.(Studentscandiscussinpairs.)Whyshould’tyoucloneanextinctanimalunlessthereisenoughdiversityinthegroup?Whyisitwrongtocloneanextinctanimalifitwouldhavetoli

6、veinazoo?Whycan’tyouclonetheDNAofanimalsthathavebeenextinctlongerthan10,000years?Whyshould’tyoucloneanextinctanimalunlessthereisenoughdiversityinthegroup?Therewillnotbeenoughgeneticvariation(遗传变异)inthegrouptobeabletoresistnewillnesses.2.Whyisitwrongtocloneanextinctanimalifitwouldhavetolivei

7、nazoo?Itisnotagoodideatocloneananimalthatwouldhavetoliveinazoobecauseitisnotasuitablehabitattodevelopandincreaseitsnumbers.Thezooisnotanaturalenvironmentforawildanimal.3.Whycan’tyouclonetheDNAofanimalsthathavebeenextinctlongerthan10,000years?TheDNAofanim