Unit 2 Cloning

Cloning is a way of making an exact _____ of another animal or plant.

What is Cloning? cop

y

______________ ： is one that occurs in a natural form of cloning without human help.

__________________:is one that is

produced through human

intervention( 介入 ) .

Two kinds of clones

Warming up

Natural clone

Man-made clone

Look at these

pictures and discuss

which ones are natural clones and

which ones are man-made. Explain

how they differ.

Discussion

A strawberry

plant

_________clone

The new plants that grow from the runners （长匐茎植物） are exact copies of the o______( 原始的 ) plant.

Natural

riginal

Growing new

plants

___________ clone

Natural

Twins

They are born naturally and identical( 一模一样 )

in ____and ___________.

sex

appearance

_________clone

Natural

Dolly was a ______ sheep.cloned

The sheep Dolly

In 1996, Dolly was born. It is the first mammal to be cloned. It is considered to be the greatest success in the development of cloning.

cloning Where is it leading us?

Book 8 unit 2

A. The impact of Dolly.

B. Cloning is a way of making an exact copy of another animal and plant.

C. People’s reaction to cloning.

D. Cloning has two major uses.

E. The problems of Dolly.

Paragraph1

Paragraph2

Paragraph3

Paragraph4

Paragraph5

The main idea of each paragraph.A. The impact of Dolly.

B. Cloning is a way of making an exact copy of another animal and plant.

C. People’s reaction to cloning.

D. Cloning has two major uses.

E. The problems of Dolly.

Paragraph1

Paragraph2

Paragraph3

Paragraph4

Paragraph5

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.

主旨大意 Where is it leading us?

scanningReading

Cloning is a way of making an exact copy of another animal and plant.

1. What is cloning ?

2. It happens both in ______ and in_______. They are both _______

plantsanimals

Para 1 The definition of cloning

natural clones

1.The major uses: Firstly, …commercial… Secondly, …research…

Para 2 The major uses and procedures of cloning

2.In this paragraph,

the word “straightforward”

means ____.

A. uncomplicated B. honest

C. frank D. difficult

Cloning plants is straightforward while( 表对比 ) cloning animals is very complicated.

The cloning of Dolly the sheep succeeded because____. A. it’s 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

细枝末节Their determination and

patience of the scientists paid off.

First, the fact that Dolly developed ______ in a natural way was __________.

Later, the news that Dolly had become seriously ill was __________.

Finally, the problem that occurred to the scientists was that a cloned animal lives_____________ the original one.

Para 3 The problems of Dolly

normallyencouraging

A. as long as B. shorter than C. longer than

disturbing

shorter than

4. The sheep that donated the

somatic cell most probably

lived ____ years.

A. 3 B. 6 C. 9 D. 13

推理判断

Altogether Dolly lived six and a half years, half the length of the life of the original sheep.

The word “controversial” in para.4 probably means :____________.

A. complicated

B. arguable

C. important

D. traditional

Para 4 The impact of Dolly

Its appearance raised and the media and public imagination.

a storm of objectionshad a great impact on

True or false:1. People feared that Cloned evil leaders 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.

Para 5 People’s reaction to cloning

some governments forbade research into human beings.

Further understanding

the author does not state a

ny personal opinion about cloning.

A. Objective (be fair)

B. Negative (be against it)

C. Positive (be in favor of it)

The writer’s attitude towards cloning

Because____________________________

_____________________________________

To Clone or not to clone ，that is a question.

Practice activity: Debate

Are you in favor of cloning or against cloning? State your point

of view on it.

ＶＳFor Against

Advantage(good points) Disadvantage(bad points)

It can make more profits forgardeners and farmers

We could use cloning to cureillness

Cloning can help saveendangered animals

Cloning can provide a copy of a child for a couple whose child has died

Cloned animals is easy to get ill anddie

youngAgainst nature and moral

Animals clones may develop the illness ofolder

animalsEvil leaders may want toclone themselves

People are afraid that scientists will create thousands of copies of the same person.

Cloning is a great breakthrough to human beings

Homework : 基础写作写作情景：今天我们班同学讨论了有关克隆的问题。同学们热烈

发表了评论和表达了自己的看法；他们主要有两种不同的意见：写作内容： 请同学们将辩论的内容整理成一篇作文。 开头已给出。 Today ,we have a heated discussion

about cloning and opinions are divided on the question. _______________________________________

However,________________________________________________________

personally, I _____________________

Thank you Bye-bye