Unit 3 Science and nature课件32（牛津高中必修5）.ppt

Book 5 Unit 3 Science and Nature Welcome to the unit Lead-in What is cloning? What do you think of the new kind of technology? Does it have advantages or disadvantages? * * Scientific definition Cloning is the creation of cells or whole animals by using DNA(脱氧核糖核酸) from a single parent, by passing (绕道而行) the normal reproductive (生殖) process. The clone has the same DNA to the “parent”. Do you know cloning? Look at the following pictures and say what you know about them. I’m the world’s first cloned mammal Dolly. Choose one and share information with others. Model 1 2 3 4 5 6 Welcome to the unit Dolly: the world’s first cloned animal created by Scottish scientists in 1996 caused worldwide discussion died in 2003 because of lung disease There are still many countries doing research on cloning technology. Model Welcome to the unit I was created using a cell from an adult cat. The kitten in the picture is called Cc. Its name is from ‘Copycat’. Scientists in the USA created it with a cell taken from its mother, Rainbow. It was born in December 2002. Welcome to the unit We are five cloned female pigs and we were born on Christmas Day 2001. Just call me Noel, OK? I’ m Angel, in your heart? I’m your Star. Love me please. Hi! I’m Joy. I’m happy-go-lucky every day. I’m the beautiful Mary Welcome to the unit I am the first cloned monkey and I was born at a research centre in the USA. Welcome to the unit I look just like my brother, that’s because I am a clone. The mule in the picture is the world’s first cloned mule. It was born on 4 May 2003. His name is Idaho Gem and his brother, Taz, was a racing mule that has won many competitions. Welcome to the unit We are a pair of new born cloned calves from Japan. The pair of calves were born on 5 July 1998 in Ishikawa, Japan. They were two years younger than Dolly, being the second adult animal clones in the world. Do you think the cloned animals are as healthy as the natural ones? Yes, Dolly is an ex