福建省南平市光泽二中高二英语选修八《Unit2 cloning》课件.ppt

look at these pictures and discuss which ones are natural clones and which ones are man-made. Commercial use : A strawberry plant Surf the Internet and find out more information about cloning. * Book 8 Unit2 cloning Warming up Cloning is a way of making an exact copy of another animal or plant. It can be divided into natural clone and man-made clone. 学.科.网 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 produced through human intervention (介入) . 学.科.网 man-made man-made natural natural 学.科.网 It’s the most famous sheep in the world. Do you know how Dolly is different from other sheep? She was cloned while the others were born naturally. It is the copy of another sheep. 学.科.网 2. Who cut off the stem of the plant? A gardener. And the gardener is going to put it into a pot to produce another plant. 学.科.网 3. What can you see in this picture? A strawberry plant produces runners in a natural form of cloning. 学.科.网 4. What do you know about twins? There are twins of the same sex and those of different sexes. The twins here are identical in sex and appearance and are good examples of natural clones. They carry the same genetic information. These two lovely girls are ____. A. twins B. cloned A Natural clones natural clones A strawberry plant can produce hundreds of new plants through its runners within one year. Dolly and its creator (1996) Tetra 2000 PPL 2000 Alpha and Beta 2001 CopyCat（CC）2001 2002 2003 Gem 2003 Dewey 2003 Prometea 2003 Snoopy 2005 克隆荧光猪2006 A clone is an animal or plant produced naturally or artificially from the cells of another animal or plant and is exactly the same as it. What is a clone? Discussion How is a clone produced? The cloning of plants is simple and easy. It can be done by taking cutting or letting the plant produce its own runners. 2.The cloning of animals i