(
课件网) Unit 3 Science and nature Welcome to the unit 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 Do you think the fast development of science and technology has been good for nature? Why 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. “Cloning” 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 Dolly and its creator What do you know about Dolly? the world’s first cloned mammal created by Scottish scientists in 1996 died in 2003 because of lung disease many countries have banned human cloning since Dolly’s 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 normal ones? Dolly is together with her mother. What do you know about Dolly? the world’s 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 banned human cloning since Dolly’s birth died 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 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 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 pigs will be used in human’s 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 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 probl ... ...
