人教版高中英语选修八课件：Unit 2 Warming up(共34张PPT)

Warming up These two lovely girls are ____. A. twins B. cloned A 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) . natural clones natural clones man-made clones cloned animals Dolly and its creator 第一只克隆宠物猫 cloned rabbit 克隆的荧光小猪(左)和 正常小猪(右) 克隆马及其 “母亲兼姐姐” The world’s first cloned mule (驴), was born on May 4. He is created from a cell of his brother. The world’s first cloned cat, kitten, named Cc. It was created using a cell taken from an adult cat, Rainbow. In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ. 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