Natural clone is one that occurs in a natural form of cloning without human help. Man-made clone is one that produced through human intervention(介入) .

Discussion In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Explain how they differ.

A strawberry plant Natural clone

Growing new plants man-made clone

Natural clone Twins

Dolly the sheep man-made clone How does Dolly differ from other sheep? She was cloned while the others were born naturally. Dolly was a ______ sheep. cloned

1996 cloning sheeps

2001 cloning cattle

2002年5月中旬成功地繁殖了一只胚胎细胞克隆兔。 我国成功繁殖克隆兔 体形要比普通兔大许多 2002年5月中旬成功地繁殖了一只胚胎细胞克隆兔。

2002 cloning cats

克隆马及其“母亲兼姐姐” 第一只克隆宠物猫

2002年4月十六日美国第一头克隆牛“艾米”产下牛犊喜作妈咪

2005 cloning dogs

克隆的荧光小猪(左)和正常小猪(右)

一株草莓依靠它沿地“爬走”的匍匐茎,一年内就能长出数百株草莓苗

富贵竹插枝即活 The gardener should cut the plant ,then the cutting produce another new plant.

Twins They are born naturally and identical in sex and appearance.

What's clone? What is cloning ? Cloning is a way of making an exact copy of another animal and plant.

How is a clone produced? Pre-reading 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 and is fully explained in the first reading.

Pre-reading What benefits can humans gain from cloning? Medical cloning can help cure serious illneses that ruin one’s quality of life . It can help infertile people have babies. 英语学习辅导报 出品

Pre-reading 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

Listening T F F T or F questions 1 Clone can be from both natural clone and man-made clone . 2 The sheep, named Kitty was the first successful clone of a mammal(哺乳动物). T F 3 Only strawberries and cactus(仙人掌) are natural clones . F

4 Since Dolley ,researcher have cloned a number of large and small animals including goats ,cows , mice , pigs, cats, rabbits and dogs . 5 A parent can clone a child who is dying of a terminal illness ( 不治之症). T F

skimming What’s the text mainly about? It’s mainly about cloning arguments about animal cloning and concerns About its future.

Do you know about: The procedure works of a sheep?

克隆羊诞生图示

Para 1 The definition of cloning It happens both in ______ and in_______. They can be cloned by ________ and _______. plants animals themselves humans Natural clone Man-made clone What is cloning ? Cloning is a way of making an exact copy of another animal and plant.

1996 The major uses and procedures of cloning Secondly, …research… Para 2 The major uses and procedures of cloning 1.How many major uses do cloning have? Firstly, …commercial… Secondly, …research… 2. When was the cloning of Dolly the sheep born? 1996

The problems of Dolly Para 3 as long as / shorter than / longer than At first, the fact that Dolly developed ______ was __________. Later, the news _____she lived for six years, half the length of the life of the ______ one was __________. Finally, a cloned animal lives _____________ the original one. normally encouraging that orginal disturbing shorter than as long as / shorter than / longer than

The word “controversial” in para 4 probably means ____________. The impact of Dolly The word “controversial” in para 4 probably means ____________. A. complicated B. arguable C. important

People’s reaction to cloning Para 5 People’s reaction to cloning True or false: 1 People feared that Cloned Hitlers would do harm to the world. 2 All the research into human beings will be forbidden. 3 Some countries will use cloning in a wise way. Many governments forbade reserch into human beings.

B. Negative (be against it) C. Positive (be in favor of it) The writer’s attitude towards cloning A. Objective (be fair) B. Negative (be against it) C. Positive (be in favor of it) Because_________________________________________________________________ the author does not state any personal opinion about cloning.

Careful reading fill in the chart using the information from the text. Add one reason of your own in each column.

Problems or dangers of cloning Advantages of cloning Animal clones may develop the illness of older animals. Medical cloning could produce cures for serious degenerative illnesses in humans. Animal clones may die younger than the donor animals Cloning plants can produce plants of similar quality for sale

There are moral objections to cloning human beings Problems or dangers of cloning Advantages of cloning Evil leaders may want to clone themselves Cloning plants can be useful for research on new plant species. There are moral objections to cloning human beings Cloning can help save endangered animals.

Post-reading 1. The main idea of the text is____ 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.

2. Which of the following statements about cloning is NOT true according to text? A. Cloning is something that has been developed quite recently. B. Twins that look exactly the same are originally from the same egg. C. Cloning is used by gardeners to make more money. D. Animal cloning is much more difficult than plant cloning.

3. The cloning of Dolly the sheep succeeded because____. A 3. The cloning of Dolly the sheep succeeded because____. A. its easier to clone 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 failed

4. The lamb is the clone of the cell from sheep because_____. A 4. The lamb is the clone of the cell from sheep because_____. A. it provides the egg cell B. it gives birth to the lamb C. it provides the nucleus D. it is a female sheep

5. The sheep that donated the somatic cell most probably lived ____ years. A. 3 B. 6 C. 9 D. 12