选修 8 unit 2 cloning

The new plants that grow from the runners （蔓藤植物）are exact copies of the original plant.
Twins
They are born naturally and identical in sex and appearance.
Cloning can help save
endangered animals Cloning can provide a copy of a child for a couple whose child has died
Quiz
In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Think about how they differ.
A strawberry plant
The writer’s attitude towards cloning
A. Objective (be fair) B. Negative (be against it) C. Positive (be in favour of it)
the author does not state any personal Because______________________________ opinion about cloning.
3. What problems may arise when humans are cloned? • People may want to clone themselves so they can live forever. • People may want to clone dead children. • People may want to clone their favourite pets.
1. What is the main topic? A A. Cloning. B. Dolly the sheep . C. It will lead us to some places. 2. What is the writing style? A A. Expositive (说明性的). B. Descriptive. C. Argumentative (议论性的).
Dolly the sheep Man-made clone
A strawberry plant Natural clone
Can you tell the difference between natural clone and man-made clone?
Natural clone is one that occurs in Clone nature without human help. Man-made clone is one that is produced through human intervention (介入).
Pre-reading
In pairs discuss what you understand about cloning. Then list the questions you want to find out. Share your lists with one another.
1. How is a clone produced？ The cloning of plants is simple and relatively easy. It can be done by taking cuttings (manmade cloning) or letting the plant produce its own runners (natural cloning). The cloning of animals is more complicated. It was not achieved until 1996 and is fully explained in the first reading.
True or false: 1. People feared that Cloned Hitlers would do harm to the world. T 2. All the research into human beings will be forbidden. F
Many governments forbade research into human beings. 3. Some countries will use cloning in a wise way. T
2. What benefits can humans gain from cloning？ Medical cloning can help cure serious illnesses that ruin one’s quality of life (such as Parkinson’s disease or Alzheimer’s disease). It can help infertile people have babies.
Disadvantage(bad points)
Cloned animals is easy to get ill and die young Against nature and raise moral questions Animals clones may develop the illness of older animals Evil leaders may want to clone themselves People are afraid that scientists will create thousands of copies of the same person.
Skimming for general idea
The main idea of the text is ______ D A. animal cloning is very valuable and can benefit the world. B. animal cloning could be misused by bad people so it must be forbidden. C. animal cloning is well developed because Dolly the sheep was born. D. animal cloning raised arguments and scientists are not sure about its future.
___________________________________
Conclusion
Advantage(good points)
Cloning is a great breakthrough to human beings It can make more profits for gardeners and farmers We could use cloning to cure illnesses
Para 4: The impact of Dolly
The word “controversial” in Para 4 probably B means ________. A. complicated
B. arguable
C. important
Para 5: People’s reaction to cloning
3. When was the cloning of Dolly the sheep born? 1996
Para 3: The problems of Dolly
About
Dolly the sheep
Encouraging news: Dolly developed
__________. normally Disturbing news: Dolly lived for six and a half years, half the length of the life of the original one.
Skimming: match the main idea with each paragraph
Para 1 A. The problems of Dolly
Para 2
Para 3 Para 4 5
B. The two major uses of cloning
C. The attitudes towards cloning D. The definition of cloning E. The effect of cloning in society
Unit2：Cloning
What’s 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. Sounds Cloning is a way of making an exact Reasonable ? copy of another animal or plant. The clone has the same DNA as the parent.
Careful reading
Para 1: The definition of cloning
plants and in _______. animals It happens both in ________ humans themselves and ________. They can be cloned by __________ Natural clone Man-made clone
Para 2: The major uses and procedures of cloning
1. How many major uses do cloning have? Firstly, …commercial… Secondly, …research… 2. How many female sheep participate in the cloning of a new sheep? 3