unit 3 Welcome to the unit课件 牛津版必修5
unit 3 Welcome to the unit课件 牛津版必修5第5页

“Cloning” is a new technology which produces an exact copy of an animal or a plant from its own cells. Dolly was the first cloned mammal created by a Scottish scientist and his group in 1996. She was exactly the same as mother, in appearance and in genes.