Cloning教学课件.ppt

1、One day, when you see a person who looks exactly the same as you ， but you dont have any twin brother or twin sisterYes, you are cloned!Unit 2CloningThey are born naturally and identical(完全相同的完全相同的) in sex and appearance.grape vinecactiLucky bamboo The gardener should cut the plant ,then the cutting

2、 produce another new plant. The first cloned animal - DollyWhats the differencebetween pictures of ?Picture Natural clone is one that happens in a natural form of cloning without human help. Picture Man-made clone is one that produced through human intervention(介入介入) . Paragraph 1 Paragraph 2 paragr

3、aph 3 paragraph 4 paragraph 5* Two major uses of cloning.* Dollys problem and death.* What is cloning ?* Peoples reaction to cloning.* The effect of Dolly. 1.skimmingDefinitionCloning is a way of making an exact _ of another_ or_.It happens It happens in _ when gardeners take_ to make new ones.It al

4、so happens in _ _that they are identical in _ and _.Cloning procedureCloning plants is _ while cloning animals is very _.2.scanningstraightforwardanimalplantplantscuttingstwinanimalssexappearancecopycomplicatedTwo major uses of cloningTo produce _ quantities of plants.It is valuable for research on

5、new _ _and for _ research on animals.The first successful animal cloneAt last the _ and _ of the scientists paid off in _ with a _- _ the mercialplantspeciesmedicaldeterminationpatience1996breakthouthDolly.1. Natural clones only happen in animals.2. Gardeners can make a lot of money by cloning plant

6、s.3.Cloning animals is as straightforward as cloning plants. FFT1.True or False4. Dolly the sheep was the first successful clone of a mammal.5. Dolly lived longer than the original sheep.6. Its easy to clone human beings.7. Evil leaders hoped to clone themselves to help others.TFFF2. Multiple choice

7、1. The word “ straightforward” in paragraph 2 is closest in meaning to _. A. easy B. fast C. difficult D. slow2. What do we use to join the nucleus and the egg cell from sheep A and B. A. water B. milk C. electricity D. cell3. The cloning of Dolly the sheep succeeded because_. A. its easier to clone

8、 a sheep than other animals B. the scientists were determined and worked hard with patience C. the scientists were rewarded and got lots of money D. many other attempts to clone mammals failed4. Which of the following is not an advantage of cloning?A. Cloning can produce cures for serious illnesses

9、in humans.B. Cloning plants can produce plants of similar quality for sale.C. Cloning can help save endangered animals.D. Cloning can help leaders to attain their ambitions.5. Which of the following is not a problem of cloning?A. Animal clones may develop the illnesses of older animals.B. Animal clo

10、nes may die younger than the donor animals.C. There are moral objections to clone human beings.D. Cloning can prevent animals from extinction.6. It can be inferred from the passage that a cloned animal_.A. usually lives as long as the original oneB. usually lives longer than the original oneC. usual

11、ly lives shorter than the original one D. is usually as healthy as the original one Do you know the procedure works of Dolly?failure!What do you think of cloning?What can we use cloning to do?Should we clone human? That cloning is good or bad depends on its use. We must be strongly against using cloning to attain evil ambitions. We should study hard and use science and technology to help others. Write an essay about “ What do you think of cloning? ”