Cloning Where Is It Leading Us?,Pre-reading Look at the pictures and discuss which ones are natural clones and which ones are man-made.,Pictures 2 , 4 A natural clone is one that occurs in nature.,Pictures 1, 3, 5 A man-made clone is one that is produced through human intervention.(干涉),Dolly the sheep,Dolly is a man-made clone and her birth procedure is explained in the first reading. She is an exact copy of the sheep that provided her genetic information. Her lamb was produced as a natural birth.,A strawberry plant,This is a strawberry plant which produces runners(长匐茎，纤匐枝) in a natural form of cloning. The new plants are exact copies of the original plant.,Growing new plants,People cut the stem off the plant and put it into a pot to produce a new plant.,Twins,They are identical in sex and appearance and are good examples of natural clones. Twins carry the same genetic(遗传的) information.,Identical dogs,This is the first cloned dog in the world (August 3rd,2005) and was produced by a lab in South Korea. It is called Snuppy and is an Afghan hound (猎犬).,T or F questions: Gardeners can make a lot of money by cloning plants. Cloning animals is as complicated as cloning plants. Dolly the sheep was the first successful clone of a mammal. Natural clones happen in animals as well as in plants.,Main ideas: 1.What is cloning?/definition 2.Two major uses of cloning in plants and animals. 3.The birth and death of Dolly. 4.Controversy brought by Dolly .,1. Dolly the sheep_. looked exactly like the sheep that provides the egg. was the exact copy of the sheep that provides the nucleus. looked like the sheep that gave birth to it. 2. Which of the following is NOT an advantage of cloning? Cloning can be used for medical purpose. Large quantities of food can be produced by cloning. Cloning can help keep animals from becoming extinct. Famous persons who have passed away can be cloned.,3. What happened to Dolly? She didnt live long. Her illnesses were also appropriate to other non-cloned sheep at her age. C. Her difficulty was believed to be the major difficulty for all cloned animals. 4. Which is TRUE according to the text? Men will die out because a woman can give birth to a baby without a husband. Not all people are in favor of cloning. Dollys appearance raised a storm in every field except the religious field.,Discussion:,1.why do you think there is more controversy over animal cloning than over plant cloning? 2.Why do you think animal cloning is more difficult than plant cloning? 3.why do you think scientists persevere with animal cloning when it is so difficult? 4.what is the major problem for the animal clone?,People can use cloning to cure serious diseases Evil leaders hoped to clone themselves Moral questions arose.,The procedure is difficult to undertake and not accurate enough,Cloning could provide medical aid.,The problems arise once a clone is produced,Discussion: Should we allow cloning?,Point 1: Cloning may provide scientists with a better insight to genetic diseases, so people can have the chance of having children free from the risk of hereditary （遗传的）diseases. Point 2: Even if someone decides to produce a clone using Hitlers genes,the output may not be the Hitler we are all so familiar with.Brought up in a gentler environment,the Hitler clone may not turn out to be Hitler himself. Point 3: Cloning is not natural. It may raise many ethical(关于伦理的)and moral issues.Would clones be as“human”as non-cloned humans? Or would they simply be walking genetic doubles?Would the clone be given as many rights as a non-cloned human?,1. The bell _ the end of the period rang, _ our heated discussion. A. indicating; interrupting B. indicated; interrupting 2.-My sons are not a little restless. -Oh? Boys _ be boys. A. should B. can C. may D. will,经常，惯于，总是：表示经常性或习惯性的动作： People will talk. 人们总是说三道四,1. take cuttings 2. growing plants 3. original egg 4. commercial quantities 5. was rewarded 6. egg cell 7. nucleus 8. somatic cell,剪下枝条 生长着的植物 原生卵子 大量的商用的 得到回报 卵细胞 细胞核 体细胞,9. donated cell 10. disturbing news 11. arbitrary fate 12. raised a storm of objections 13. became controversial 14. accumulate evidence,提供的细胞核 坏消息 无法控制的命运 引起强烈的反对 引起争议 收集证据,1 Cloning has always been with us and is here to stay. 克隆一直与我们同在，而如今它还要持续下去。 2 It also happens in animals when twins identical in sex and appearance are produced from the same original egg. 这种现象也发生在动物身上，从同一个原生卵产生与外貌相同的双胞胎也是克隆。 3. The whole scientific world followed the progress of the first successful clone, Dolly the sheep. 整个科学界都在关注着首例成功的克隆动物多莉羊的成长。 4. Cloning scientists were cast down to find that Dollys illnesses were more appropriate to a much older animal. 研究克隆的科学家们沮丧地发现多莉得的病更容易发生在年老的动物身上。,5. Sadly the same arbitrary fate affected other species, such cloned mice. 可悲的是，同样无法控制的命运也在影响着其他物种， 如克隆鼠。 6. Dollys appearance raised a storm of objections and had a great impact on the media and public imagination. 多莉的出生引起了一阵强烈的反对，对媒体和公众的想象力也产生了巨大的影响。 7.