M5U3Welcome.ppt

* Module 5, Unit 3 Welcome to the unit The advanced technique in genetics(遗传学) with which scientists can create or copy things with the same DNA is called -? clone Scientific definition Cloning is the creation of cells or whole animals by using DNA(脱氧核糖核酸) from a single parent, bypassing (绕道而行) the normal reproductive (生殖) process. The clone has the same DNA to the “parent”. Dolly and its creator cloned female pigs cloned calves from Japan the first cloned monkey. cloned chicken the cloned deer Do you think the cloned animals are as healthy as the natural ones? Dolly is, but scientists do not yet know whether this is the exception(例外) or the rule. Some early evidences suggest that clones may have health problems and that they may age prematurely (早衰的，未老先衰). If you are a scientist, what do you want to clone? Why? Brainstorming More contributions to human More world champions China, a more harmonious community Just imagine Supposing you are facing your second self who looks like you, talks like you and thinks like you, how do you feel? Try to describe Bush’s feelings. If cloning goes wrong, what will happen? Fun pictures A dog or an eagle? A duck or a crocodile? A cock or a dog? A lion or a kangaroo? A frog or a crocodile? A tortoise or a bear? A bird or a dog? A dog or a man? Discussion Do you think governments should pass laws to prohibit human cloning? Why or why not? Party A They shouldn’t, for… reasons: Cloning can help cure many diseases and save a lot of people’s lives. 2. …… 3. …… Party B They should, for… reasons: Cloning can lead to ethical(伦理) problems. 2. …… 3. ……