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人教新课标高二英语book8 unit2 cloning warming up ppt课件

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isthecopyofanothersheep.man-madeclonesWhatcanyouseeinthepicture?wecanseeastrawberryplantproducingrunnersinanaturalformofcloning.naturalclones一株草莓依靠它沿地“爬走”的匍匐茎,一年内就能长出数百株草莓苗Whocutthestemofftheplant?Why?Agardener.Andthegardenerisgoingtoputitintoapottoproduceanewone.Heisactuallymakingacopyoftheplant.naturalclonesWhatdoyouknowabouttwins?Therearetwinsofthesamesexandthoseofdifferentsexes.Thetwinshereareidenticalinsexandappearanceandaregoodexamplesofnaturalclones.icinformation.Thefertilizedegghassplitintotwowhileinsidethemother,andsoproducedtwoidenticalhumanbabies.naturalclonesArethefollowingclonesthesame?Ifnot,whatisthedifference?NO.Thefirstisman-madeclones,andtherestarenaturalclones.2002年4月十六日美国第一头克隆牛“艾米”产下牛犊喜作妈咪我国成功繁殖克隆兔?体形要比普通兔大许多2002年5月中旬成功地繁殖了一只胚胎细胞克隆兔。第一只克隆宠物猫克隆马及其“母亲兼姐姐”克隆的荧光小猪(左)和正常小猪(右)

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