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1、新课标人教版课件系列高中英语选修选修( (模块）模块）8- 8-2.4Reading In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Explain how they differ.Warming up一株一株草莓依靠它沿地草莓依靠它沿地“爬走爬走”的匍匐的匍匐茎茎,一年内就能长出数百株草莓苗一年内就能长出数百株草莓苗富贵竹插枝即活富贵竹插枝即活仙人掌每块落地就生根仙人掌每块落地就生根Dolly是世界上第是世界上第一例用体细胞一例用体细
2、胞乳乳腺上皮细胞腺上皮细胞,通过通过细胞核移植技术细胞核移植技术,在复杂的人工操在复杂的人工操作下作下,得到的一只得到的一只小绵羊小绵羊 。多利多利20022002年年4 4月十六日月十六日美国第一美国第一头克隆牛头克隆牛“艾米艾米”产下牛犊产下牛犊喜作妈咪喜作妈咪我国成功繁殖克隆兔我国成功繁殖克隆兔 体形要比普通兔大许多体形要比普通兔大许多20022002年年5 5月月中旬成功地中旬成功地繁殖了一只繁殖了一只胚胎细胞克胚胎细胞克隆兔。隆兔。第一只克隆宠物猫第一只克隆宠物猫克隆马及其克隆马及其“母母亲兼姐姐亲兼姐姐”克隆的荧光小猪克隆的荧光小猪(左左)和正常小猪和正常小猪(右右) 克隆克隆,是
3、是Clone的的译音音,意意为生物体通生物体通过细胞胞进行的无性繁殖形成的基因型行的无性繁殖形成的基因型完全相同的后代个体完全相同的后代个体组成的种群成的种群,简称称为无性繁殖无性繁殖。 克隆克隆一一词于于1903年年被引入园被引入园艺学学,以后逐以后逐渐应用于植物学、用于植物学、动物学和医学等方面。物学和医学等方面。但克隆与无性但克隆与无性繁殖是不同的。无性繁殖是指不经过繁殖是不同的。无性繁殖是指不经过雌雄两性生殖细胞的结合、只由雌雄两性生殖细胞的结合、只由一个生物体产生后代的生殖方式一个生物体产生后代的生殖方式,常见常见的有孢子生殖、出芽生殖和分裂生殖。的有孢子生殖、出芽生殖和分裂生殖。由
4、植物的根、茎、叶等经过压条或嫁由植物的根、茎、叶等经过压条或嫁接等方式产生新个体也叫无性繁殖。接等方式产生新个体也叫无性繁殖。绵羊、猴子和牛等动物没有人工操作绵羊、猴子和牛等动物没有人工操作是不能进行无性繁殖的。是不能进行无性繁殖的。科学家把人科学家把人工遗传操作动物繁殖的过程叫克隆工遗传操作动物繁殖的过程叫克隆,这这门生物技术叫克隆技术。门生物技术叫克隆技术。 克隆的基本过程是先将含有遗传物克隆的基本过程是先将含有遗传物质的供体细胞的核移植到去除了细胞核质的供体细胞的核移植到去除了细胞核的卵细胞中的卵细胞中,利用微电流刺激等使两者利用微电流刺激等使两者融合为一体融合为一体,然后促使这一新细胞
5、分裂然后促使这一新细胞分裂繁殖发育成胚胎繁殖发育成胚胎,当胚胎发育到一定程当胚胎发育到一定程度后度后,再被植入动物子宫中使动物怀孕再被植入动物子宫中使动物怀孕,便可产下与提供细胞者基因相同的动物。便可产下与提供细胞者基因相同的动物。这一过程中如果对供体细胞进行基这一过程中如果对供体细胞进行基因改造因改造,那么无性繁殖的动物后代基那么无性繁殖的动物后代基因就会发生相同的变化。因就会发生相同的变化。 In pairs discuss what you understand about clothing. Then list the questions you want to find out .S
6、hare your lists with one another.Pre-readingQuestions about cloning1. What is a clone?A clone is group of cells or organisms that are genetically identical and have been produced asexually from the same original cell. They include natural and man-made clones.2. How is a clone produced?The cloning of
7、 plants is simple and relatively easy. It can be done by taking cuttings (man-made cloning) or letting the plant produce its own runners (natural cloning). The cloning of animals is more complicated. It was not achieved until 1996 and is fully explained in the first reading.3. What benefits can huma
8、ns gain from cloning?1) Medical cloning can help cure serious illnesses that ruin ones quality of life (such as Parkinsons disease or Alzheimers disease).2) It can help infertile people have babies.4. What problems may arise when humans are cloned?1) People may want to clone themselves so they can l
9、ive forever.2) People may want to clone dead children.3) People may want to clone their favorite pets.Reading Please read the reading to get main Please read the reading to get main idea, and then in groups, finish the idea, and then in groups, finish the following exercises. following exercises. 1.
10、 The main idea of the text is_ A. animal cloning is very valuable and can benefit the world. B. animal cloning could be misused by bad people so it must be forbidden主旨大意主旨大意C. animal cloning is well developed because Dolly the sheep was born. D. animal cloning raised arguments and scientists are not
11、 sure about its future.2. Which of the following statements about cloning is NOT true according to text?_ A. Cloning is something that has been developed quite recently. B. Twins that look exactly the same are originally from the same egg.细枝末节细枝末节C. Cloning is used by gardeners to make more money.D.
12、 Animal cloning is much more difficult than plant cloning.A3. The cloning of Dolly the sheep succeeded because_. A. its easier to clone a sheep than other animals B. the scientists were determined and worked hard with patienceC. the scientists were rewarded and got lots of moneyD. many other attempt
13、s to clone mammals failedB4. The lamb is the clone of the cell from sheep because_. A. it provides the egg cell B. it gives birth to the lamb C. it provides the nucleus D. it is a female sheep5. The sheep that donated the somatic cell most probably lived _ years. A. 3 B. 6 C. 9 D. 12推理判断推理判断Do you k
14、now about: The procedure works of a sheep? 克克隆隆羊羊诞诞生生图图示示 “多利多利”的诞生标志着克隆研究的诞生标志着克隆研究取得新的进展和重大突破取得新的进展和重大突破,而且这个结而且这个结果证明果证明:动物体中执行特殊功能动物体中执行特殊功能,具有具有特定形态的所谓高度分化的细胞与受特定形态的所谓高度分化的细胞与受精卵一样具有发育成完整个体的潜在精卵一样具有发育成完整个体的潜在能力。也就是说能力。也就是说,动物细胞与植物细胞动物细胞与植物细胞一样一样,也具有全能性也具有全能性.“多利多利”的诞生有什么重大的意义和影响？的诞生有什么重大的意义和影响？
15、 1. It suddenly opened everybodys eyes to the possibility of using cloning to cure serious illnesses, and even producing human beings. 突然每个人都看到了利用克隆技术治突然每个人都看到了利用克隆技术治愈重病愈重病, 甚至制造人的可能性。甚至制造人的可能性。 长句难句长句难句:of using cloning to cure serious illnesses , and even producing human beings作定语作定语,其中其中using和和p
16、roducing是并列关系。是并列关系。2. Newspapers told stories of evil leaders hoping to clone themselves and religious leaders raises moral questions. 报纸报道了不良领导人希望克隆自己报纸报道了不良领导人希望克隆自己的消息的消息, 宗教领袖提出了道德方面的宗教领袖提出了道德方面的质疑。质疑。由由and 连接了两个并列分句连接了两个并列分句, 前句中前句中hoping to clone themselves作宾补。作宾补。句中句中stories意为意为“消息消息”。 例句观察例
17、句观察(课文原句课文原句)The fact is that they are natural clones of each other.（作表语）（作表语）The fact that she seemed to develop normally was very encouraging.（作（作同位语）同位语）语法专攻语法专攻:Then came the disturbing news that Dolly had become seriously ill.（作同（作同位语）位语） However, scientists still wonder whether cloning will he
18、lp or harm us and where it is leading us.（作宾语）（作宾语） Cloning people is a good thing ,or a bad thing?克隆人是福音克隆人是福音, 还是恶兆？还是恶兆？Thinking意大利狂人医生意大利狂人医生:安蒂诺里安蒂诺里冒死也要克隆人的冒死也要克隆人的科学家科学家:布瓦瑟利耶布瓦瑟利耶1.克克隆隆技技术术现现在在还还不不成成熟熟,克克隆隆人人可可能能有有很很多多先先天天性性生生理理缺陷。缺陷。2.克克隆隆人人的的身身份份难难以以认认定定,他他们们与与被被克克隆隆者者之之间间的的关关系系无无法纳入现有的伦理体
19、系。法纳入现有的伦理体系。反对克隆人反对克隆人3. 克隆技术有可能被滥用克隆技术有可能被滥用,成为恐成为恐怖分子的工具。怖分子的工具。4. 从生物多样性上来说从生物多样性上来说,大量基因大量基因结构完全相同的克隆人结构完全相同的克隆人,可能诱可能诱发新型疾病的广泛传播发新型疾病的广泛传播,对人类对人类的生存不利。的生存不利。1. “不不让让我我们们克克隆隆人人,就就是是不不让让我我 们们 修修 正正 我我 们们 的的 错错 误误 ,人人 类类 历历史史难难道道能能够够这这样样构构造造吗吗？”纽约时报书评纽约时报书评2. “当当然然应应该该克克隆隆人人,如如果果谁谁第第一一个个掌掌握握了了这这个
20、个技技术术,他他就就是是我我真真正正的的、也也是是唯唯一一的的竞竞争争对对手手。”比比尔尔盖盖茨茨支持克隆人支持克隆人3. “克隆人绝对是科学上了不起的进步克隆人绝对是科学上了不起的进步,克隆技术必将创造克隆技术必将创造21世纪的辉煌。世纪的辉煌。” 麻省理工学院生命工程教授约翰麻省理工学院生命工程教授约翰布洛克布洛克4. “人体商业化是人类经济活动中无与伦人体商业化是人类经济活动中无与伦比的成就比的成就,毫无疑问毫无疑问,克隆技术的出现克隆技术的出现将为世人创造一个最为广泛和深远的将为世人创造一个最为广泛和深远的市场。市场。” 英国英国经济学家经济学家杂志。杂志。Homework Finish off Ex.1,2,3, Page12.
