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1、Unit 3 Science and nature Welcome to the unit ObjectivesTo get a general idea of what we are going to learn in this unitTo know something about cloneTo learn to discuss about clone or cloned animalsThinking Do you think the fast development of science and technology has been good for nature?Why or w
2、hy not?How should science and nature relate to each other?Do you think that human beings should try to control nature?Should we do anything against the laws of nature?Do you know something about cloning(克隆克隆)?Man has created many things and now they are even ready to recreate themselves.“Cloning”is
3、a new biotechnology(生物技术生物技术)which aims to produce an exact copy of an animal or a plant from its own cells,DNA fragments(片段片段)or organisms(有有机体机体)in an asexual(无性繁殖的无性繁殖的)way.Cloned animals What do you see from this video?Dolly and its creatorWhat do you know about Dolly?the worlds first cloned mam
4、mal created by Scottish scientists in 1996 died in 2003 because of lung disease many countries have banned human cloning since Dollys birth Look at the following pictures and study them.Can you tell what is the main feature of cloning?Can you identify the differences between the cloned animals and n
5、ormal ones?Dolly is together with her mother.What do you know about Dolly?the worlds first cloned mammal created by Scottish scientists in 1996 sparked worldwide interest and concern after its birth many countries,including Germany,France,Canada,Switzerland,Austria,Norway and South America,have bann
6、ed human cloning since Dollys birth died in 2003 because of lung diseaseThe kitten in the picture is called CC.Its name is from“Copycat”.It was born in December 2002.The researchers in Texas produced CC with a cell taken from her mother Rainbow.CC was a healthy kitten who grew into a lively affectio
7、nate house cat.She is not the exact copy of her clone-mother because they grew up in different surroundings,though the shared the same genes.These female pigs are also cloned.They were born on Christmas Day 2001.They were Noel,Angel,Star,Joy and Mary.Although they are not the first cloned pigs,they
8、are actually the first to be engineered in a way that their organs more suitable for transplantation into humans.Due to the shortage of human organs for transplants,many people are dying because some of their organs do not work.It is hoped that the organs from these pigs will be used in humans bodie
9、s.The name of the first cloned monkey is ANDi.It is from“inserted DNA”spelt backwards.The playful coffee-coloured monkey was born in 2000.The technology is different from thatused for Dolly.Researchers in Oregon,the USA created this first genetically modified monkey by putting a gene form a jellyfis
10、h,another species,into six-day-old monkey embryos(胚胎胚胎).From the appearance,the cloned animals are exactly the same as the original ones.However,some cloned animals were reported to have health problems and died usually young.The pair of calves were born on 5 July 1998 in Ishikawa,Japan.They were tw
11、o years younger than Dolly,being second adult animal clones in the world.More examples about cloned animalsThe mule in the picture is the worlds first cloned mule.It was born on 4 May 2003.His name is Idaho Gem.In 1962,the scientist Gurdon from Cambridge cloned a tadpoleIn 1963,Chinese scientist Ton
12、g Dizhou cloned a carp,which was 33 years earlier than Dolly.Born in 2005 in Seoul University in KoreaSnoopyWhat do you think of the new kind of technology?Does it have any advantages or disadvantages?Advantages of cloning:cure many genetic diseases save peoples lives prevent some endangered animals
13、 from dying outDisadvantages of cloning:cause ethical problems violate(违背违背)human rights violate the laws of nature Do you think it would be a good idea to clone humans some day?Why or why not?It is a good idea,forreasons:1.Cloning can help cure many diseases and save a lot of peoples lives.2.3.Part
14、y AIt is a bad idea,forreasons:1.Cloning can lead to ethical(伦理伦理)problems.2.3.Party BIf possible,do you want another person to be exactly the same as you?Just imagineJust imagineSupposing you are facing your second self who looks like you,talks like you and thinks like you,how do you feel?One man,o
15、ne world?Funny picturesFunny picturesIf cloning goes in a wrong direction,what will happen?A dog or an eagle?A dog or an eagle?A duck or a crocodile?A duck or a crocodile?A cock or a dog?A cock or a dog?A lion or a kangaroo?A lion or a kangaroo?A frog or a crocodile?A frog or a crocodile?A tortoise
16、or a bear?A tortoise or a bear?A bird or a dog?A bird or a dog?A dog or a man?A dog or a man?Who is this?克隆如何才能和谐？克隆如何才能和谐？Think about what weve just learnt today.Time for Reflection Study without reflection is a waste of time.Think in English After the classIts time to stop the class for you to loo
17、k back in silence.HomeworkWrite a short passage about whether it is a good idea to clone humans.Today our class had a discussion about whether it is a good idea to clone humans.Some students think that it is good,for However,some other students think it is not a good idea,forIn my opinion,Thank you!
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