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

1、Warming upThese two lovely girls are _.A.twins B.clonedAClone?Natural cloneMan-made cloneNatural 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 clonesnatural clonesman-made clonescloned an

2、imalsDolly 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 worlds first cloned mule(驴),was born on May 4.He is created from a cell of his brother.The worlds first cloned cat,kitten,namedCc.It was created using a cell taken from an adult cat,Rainbow.In pairs,look at these pictur

3、es and discuss which ones are natural clones and which ones are man-made.Think about how they differ.1.Its 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 sheep.2.What can you see in

4、the second picture?A strawberry plant producing runners in a natural form of cloning.3.Who cut off the stem of the plant?A gardener.And the gardener is going to put it into a pot to produce another plant.4.What do you know about twins?There are twins of the same sex and those of different sexes.The

5、twins here are identical in sex and appearance and are good examples of natural clones.They carry the same genetic information.Are the following clones the same?If not,what is the difference?NO.Dolly is an example of man-made clone.The twins are natural clones.The advanced technique in genetics(遗传学)

6、with which scientists can create or copy things with the same DNA.What is a clone?Discussion Scientific DefinitionScientific Definition Cloning is the creation of cells or whole animals by using DNA from a single“parent”,not with the normal reproductive process.The clone has the same DNA to the“pare

7、nt”.How is a clone produced?Problems or dangers of cloningAnimal clones may develop the illnesses of older animals.Animal clones may die younger than the donor animals.Evil leaders may want to clone themselves.There are moral objections to cloning human beings.Advantages of cloningMedical cloning co

8、uld produce cures for serious illnesses in humans.Cloning plants can produce plants of similar quality for sale.Cloning plants can be useful for research on new plant species.Cloning can help save endangered animals.True or False1.Cloning means making a copy of an animal or a plant.2.Gardeners can m

9、ake a lot of money by cloning plants.3.Cloning animals is as complicated as cloning plants.4.Dolly the sheep was the first successful clone of a mammal.5.Natural clones happen in animals as well as in plants.FFTTTOh!My God!I was cloned!Is it good cloning people?1.differ vi.In pairs,look at these pic

10、tures and discuss which ones are natural clones and which ones are man-made.Explain how they differ.两人一组,观察图片并讨论哪些是自然无性繁殖,哪些是人工的。解释它们的区别。differ(vi.),主要有两个义项:“不同,相异；不同意,意见相左”。常见的搭配有:New Words1)sb.differ from/with sb.on/upon/about sth.:某人与某人在.方面意见不同2)sth.and sth.differ in:某物与某物在.方面不同3)sth.differ from

11、sth.:某物与某物不同difference n.不同different adj.不同的Chinese differs greatly from English in pronunciation.汉语与英语在发音上有很大的不同。Modern airplanes differ from early ones.现代飞机跟早期的在很多方面有所不同。I differ with him how to solve the problem.对于如何解决问题,我跟他的意见不一致。They differ with each other on moral standards.关于道德标准,他们的见解不同。The

12、boy differs from his mother in character.这个小男孩在性格方面不同于他的母亲。1)We differ _ him _ that question.2)The two nations differ _ culture and religion.3)The climate here differ _ that of the South.from/withon/about/uponinfrom/with用介词 from,with,on,about,upon 或in 填空。Surf the Internet and find out more information about cloning.Homework