1、Unit 3Science and nature,Welcome to the unit,Objectives,To get a general idea of what we are going to learn in this unit To know something about clone To learn to discuss about clone or cloned animals,Thinking,Do you think the fast development of science and technology has been good for nature? Why
2、or why 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)?,Man has created many things and now they are even ready to recreate themselves.,“Clon
3、ing” is a new biotechnology (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) or organisms (有机体) in an asexual (无性繁殖的) way.,Cloned animals,What do you see from this video?,Dolly and its creator,What do you know about Dolly?,the worlds first clo
4、ned mammalcreated by Scottish scientists in 1996died in 2003 because of lung diseasemany 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
5、 and normal ones?,Dolly is together with her mother.,What do you know about Dolly?,the worlds first cloned mammalcreated by Scottish scientists in 1996sparked worldwide interest and concern after its birth many countries, including Germany,France, Canada, Switzerland, Austria, Norway and South Ameri
6、ca, have banned human cloning since Dollys birthdied in 2003 because of lung disease,The 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
7、 a lively affectionate 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
8、the first cloned pigs, they 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 pi
9、gs will be used in humans bodies.,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 that used for Dolly.,Researchers in Oregon, the USA created this first genetically modified
10、monkey by putting a gene form a jellyfish, another species, into six-day-old monkey embryos (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
11、 on 5 July 1998 in Ishikawa, Japan. They were two years younger than Dolly, being second adult animal clones in the world.,More examples about cloned animals,The 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
12、Cambridge cloned a tadpole,In 1963, Chinese scientist Tong Dizhou cloned a carp, which was 33 years earlier than Dolly.,Born in 2005 in Seoul University in Korea,Snoopy,What do you think of the new kind of technology? Does it have any advantages or disadvantages?,Advantages of cloning: cure many gen
13、etic diseasessave peoples lives prevent some endangered animals from dying out Disadvantages of cloning:cause ethical problemsviolate (违背) human rightsviolate 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 , for,reasons:,Cloning ca
14、n help cure many diseases and save a lot of peoples lives. 2. 3. ,Party A,It is a bad idea, for,reasons:,Cloning can lead to ethical (伦理) problems. 2. 3. ,Party B,If possible, do you want another person to be exactly the same as you?,Just imagine,Supposing you are facing your second self who looks l
15、ike you, talks like you and thinks like you, how do you feel?,One man, one world?,Funny pictures,If cloning goes in a wrong direction, what will happen?,A dog or an eagle?,A duck or a crocodile?,A cock or a dog?,A lion or a kangaroo?,A frog or a crocodile?,A tortoise or a bear?,A bird or a dog?,A do
16、g or a man?,Who is this?,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 class,Its time to stop the class for you to look back in silence.,Homework,Write 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, for In my opinion, ,Thank you !,