人教版高中英语选修八 Unit2 Cloning warming up and pre-reading课件（共20张）
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| 名称 | 人教版高中英语选修八 Unit2 Cloning warming up and pre-reading课件（共20张） |  | |
| 格式 | zip | ||
| 文件大小 | 1.8MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 人教版（新课程标准） | ||
| 科目 | 英语 | ||
| 更新时间 | 2019-03-04 21:56:06 | ||
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课件20张PPT。新课标高二版.选修八Cloning Unit 2Warming upEnable the students to know what is
cloning.
Enable the students to know what are
natural clones and man-made clones.
Enable the students to know some basic
knowledge about cloning. A clone is an animal or plant produced naturally or artificially from the cells of another animal or plant and is exactly the same as it.What's a clone?克隆是英语单词clone的音译，clone源于希腊文klon，原意是指幼苗或嫩枝，以无性繁殖或营养繁殖的方式培育植物，如杆插和嫁接。 如今，克隆是指生物体通过体细胞进行的无性繁殖，以及由无性繁殖形成的基因型完全相同的后代个体组成的种群。克隆也可以理解为复制、拷贝，就是从原型中产生出同样的复制品，它的外表及遗传基因与原型完全相同。 1997年 2月，绵羊“多利”诞生的消息披露，立即引起全世界的关注，这头由英国生物学家通过克隆技术培育的克隆绵羊，意味着人类可以利用动物身上的一个体细胞，产生出与这个动物完全相同的生命体，打破了千古不变的自然规律。 Dolly the sheepA strawberry plantGrowing new plantsTwins In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ.The first one is a man-made clone,
the rest three are natural clones.Natural clone is one that occurs from the “parent ” in a natural form of cloning without human help. Man-made clone is one that produced through human intervention(介入) . 自然克隆:由无性生殖或是由于偶然的原因产生两个遗传上完全一样的个体（就像同卵双生一样）。 人工克隆:通过有意识的设计来产生的完全
一样的复制。 twinsMore natural cloning examples cucumberpepperred –leave poplar treeMore man-made cloning examples 2. How is a clone produced?The cloning of plants is simple and relatively easy. It can be done by taking cuttings (man-made cloning) or letting the plant produce its own runners (natural cloning).
The cloning of animals is more complicated. It was not achieved until 1996 .
Here is an example to show how a clone is produced.
A female sheep provides an egg cell. The nucleus is removed from the egg cell.Cloning procedureStep 1How do scientists clone a sheep? A second female sheep provides a somatic cell. The nucleus is also taken out. Cloning procedureStep 2 The egg cell from sheep A and the nucleus from sheep B are joined together using electricity.Cloning procedureStep 3 The combined cell divides and grows into an embryo.Cloning procedureStep 4 The embryo is then put into female sheep C. Finally a sheep D is cloned.Cloning procedureStep 53. What benefits can humans gain from cloning?1) Medical cloning can help cure serious illnesses that ruin one’s quality of life (such as Parkinson’s disease or Alzheimer’s disease).
2) It can help infertile people have babies.4. What problems may arise when humans are cloned?1) People may want to clone themselves so they can live forever.
2) People may want to clone dead children.
3) People may want to clone their favorite pets.Preview Reading: Cloning; where is it leading us?
Do the Comprehending on P12 of the textbook.
cloning.
Enable the students to know what are
natural clones and man-made clones.
Enable the students to know some basic
knowledge about cloning. A clone is an animal or plant produced naturally or artificially from the cells of another animal or plant and is exactly the same as it.What's a clone?克隆是英语单词clone的音译，clone源于希腊文klon，原意是指幼苗或嫩枝，以无性繁殖或营养繁殖的方式培育植物，如杆插和嫁接。 如今，克隆是指生物体通过体细胞进行的无性繁殖，以及由无性繁殖形成的基因型完全相同的后代个体组成的种群。克隆也可以理解为复制、拷贝，就是从原型中产生出同样的复制品，它的外表及遗传基因与原型完全相同。 1997年 2月，绵羊“多利”诞生的消息披露，立即引起全世界的关注，这头由英国生物学家通过克隆技术培育的克隆绵羊，意味着人类可以利用动物身上的一个体细胞，产生出与这个动物完全相同的生命体，打破了千古不变的自然规律。 Dolly the sheepA strawberry plantGrowing new plantsTwins In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ.The first one is a man-made clone,
the rest three are natural clones.Natural clone is one that occurs from the “parent ” in a natural form of cloning without human help. Man-made clone is one that produced through human intervention(介入) . 自然克隆:由无性生殖或是由于偶然的原因产生两个遗传上完全一样的个体（就像同卵双生一样）。 人工克隆:通过有意识的设计来产生的完全
一样的复制。 twinsMore natural cloning examples cucumberpepperred –leave poplar treeMore man-made cloning examples 2. How is a clone produced?The cloning of plants is simple and relatively easy. It can be done by taking cuttings (man-made cloning) or letting the plant produce its own runners (natural cloning).
The cloning of animals is more complicated. It was not achieved until 1996 .
Here is an example to show how a clone is produced.
A female sheep provides an egg cell. The nucleus is removed from the egg cell.Cloning procedureStep 1How do scientists clone a sheep? A second female sheep provides a somatic cell. The nucleus is also taken out. Cloning procedureStep 2 The egg cell from sheep A and the nucleus from sheep B are joined together using electricity.Cloning procedureStep 3 The combined cell divides and grows into an embryo.Cloning procedureStep 4 The embryo is then put into female sheep C. Finally a sheep D is cloned.Cloning procedureStep 53. What benefits can humans gain from cloning?1) Medical cloning can help cure serious illnesses that ruin one’s quality of life (such as Parkinson’s disease or Alzheimer’s disease).
2) It can help infertile people have babies.4. What problems may arise when humans are cloned?1) People may want to clone themselves so they can live forever.
2) People may want to clone dead children.
3) People may want to clone their favorite pets.Preview Reading: Cloning; where is it leading us?
Do the Comprehending on P12 of the textbook.