选修八 2.7《Unit 2 warming-up》.ppt
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1、新课标人教版课件系列,高中英语 选修(模块)8-2.7,Unit 2 Cloning warming up and speaking,Do you enjoy watching TV series ? Have you ever seen Journey To The West ?,What is clone ?,Clone,Clone, also called reproduce asexually ( 无性生殖 /繁殖) , is the creation of cells or whole animals using DNA from a single “parent”, without
2、 using the normal reproductive (有性生殖) process. The clone has the same DNA to the parent.,Whats clone?,clone,Natural clone,Man-made clone,Natural clone is one that occurs from the “parent ” in a natural form of cloning without human help. Man-made clone is one that produced through human intervention
3、(介入) .,cactus,strawberry,twins,pendulum orchid(吊兰),natural cloning examples,Man-made cloning examples,the important events in cloning history,In 5000B.C. ( 谷物选种) Human Beings began to choose the best seeds from some kinds of crops. That was the beginning of controlling life according to humans will.
4、,In 1952: Cloning tadpole ( 克隆蝌蚪) The American scientists created a copy of tadpole by means of using a tadpole cell. This tiny tadpole has become the first kind of cloning animal.,In 1978: The first case of tube infant (试管婴儿 ) appeared. A British doctor used the sperm(精液)of a man and fertilized(受精
5、) it in a test tube(试管). Then transplanted(移植) the embryo(胚胎) into the womb(子宫 ) of a healthy mother. The first tube infant called Louis appeared.,In 1996, the famous sheep “Dolley” was cloned successfully,Dolley and the Father of Dolley Lanwilmut ( 伊恩.威尔姆),In 1998 A series of things were cloned. Th
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