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Are they clones?
natural clone
man-made clone
clone
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) .
cactus pendulum orchid
(吊兰)
natural cloning examples
strawberry twins
natural cloning examples
There are twins of the same sex and those
of different sexes. The twins here are
identical in sex and appearance and are
good examples of natural clones. They
carry the same genetic information. The
fertilized egg has split into two while
inside the mother, and so produced two
identical human babies.
man-made cloning examples
the first cloned cat
Dolly the sheep
It’s 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.
Questions about cloning:
1. What is a clone?
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.
2. How is a clone produced?
The cloning of plants is simple and
relatively easy. It can be done by taking
cuttings or letting the plant produce its
own runners. The cloning of animals is
more complicated. It was not achieved
until 1996 and is fully explained in the
first reading.
3. What benefits
can humans gain
from cloning?
1.By cloning, farmers can
produce quantities of
different commercial plants.
2.Medical cloning can
help cure serious
illnesses that ruin
one’s quality of life
(such as Parkinson’s
disease帕金森症 )
3.Cloning can help save
endangered animals.
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.
The text is mainly about the 1. _________
of animal cloning and the life of Dolly the
sheep, as well as the reasons why cloning is
still 2. ___________.controversial
procedure
Read the text quickly and complete
its main idea.
Read through the
passage and find
the main idea of
each paragraph.
Ⅰ. Read the text and then match the
main idea with each paragraph.
Para 1:（ ） A. Dolly’s problem and death.
Para 2:（ ） B. What is cloning?
Para 3:（ ）C. Two major uses of cloning.
Para 4:（ ）D. Arguments brought by
Dolly.
Para 5:（ ）E. The effect of Dolly.
B
C
A
E
D
Ⅱ . Scan the text and then choose the best answer according to the text.
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.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
【答案】D
【答案】C
3.It can be learnt from the passage that a cloned animal .
A. usually lives as long as the original one
B. usually lives longer than the original one
C. usually dies earlier than the original one
D. is usually as healthy as the original one
4.Which of the following is NOT a problem or danger of cloning
mentioned in the text?
A. Evil leaders may want to clone themselves.
B. Animal clones may develop the illness of older animals and
may die younger than the donor animals.
C. There are moral objections to cloning human beings.
D. Too much cloning may lead to the destruction of the balance of
nature.
【答案】C
【答案】D
5.Which of the following is NOT an advantage of cloning?
A. Cloning can be used for medical purposes.
B. Large quantities of food can be produced by cloning.
C. Famous persons who have passed away can be
cloned.
D. Cloning can help keep animals from becoming
extinct.
6.In Para.2,the word “straightforward” means .
A. Uncomplicated
B .honest
C. Frank
D. difficult
【答案】C
【答案】A
7.We can infer from the last three paragraphs that .
A. The normal development of Dolly had no effect on the cloning
of other species
B. Dolly’s serious disease and final death disturbed the whole
world
C. Dolly successfully cloned a new lamb with the help of cloning
scientists
D. There were arguments about animals cloning and concerns
about the future of cloning
8.What about the writer’s attitude toward cloning in this passage?
A. The writer is against cloning.
B. The writer is in favor of cloning.
C. The writer does not state any personal opinion about cloning.
D. The writer is in agreement with cloning.
【答案】D
【答案】C
Read the text carefully and fill in
the blanks.
Definition Cloning is a way of making
____________ of another animal
and plant.
Major
uses of
cloning
• Gardeners use it to _______
commercial quantities of plants.
• It is valuable for research on
new plant species and for
_______ research on animals.
an exact copy
produce
medical
About
Dolly
the
sheep
◆ Encouraging news: Dolly
seemed to develop ________.
◆ Disturbing news: Dolly lived
only six and a half years, half
the length of the life of the
_______ sheep, because of
serious illnesses which were
more appropriate to a
________________.
normally
original
much older animal
Do you know about the procedure
works of a sheep?
Reproductive cloning is intended to
produce a c___ of an existing a_____ or a
plant. Reproductive cloning of animals is
a______ for technology and farming as
well as for cloning e_________ animals.
But reproductive cloning of human
beings is specifically f________ by law in
most c_______.
opy nimal
ndangered
llowed
orbidden
ountries
Therapeutic (治疗的) cloning is to produce a
healthy copy of a s___ person’s tissue (肌肉
组织) or organ for transplant in order to save
the lives of those who would d___ without it.
This t________ would be many times better
than r______ on organ transplants from
other people. The tissue or organ would have
the sick person’s original DNA.
ick
ie
echnique
elying
Go through paragraph four and
f i v e , t r y t o f i n d o u t t h e
advantages and disadvantages of
cloning
Comprehend
ing
Advantages
using cloning to cure serious illnesses
help save endangered animals
produce plants of similar quality for sale
cloning plants can be useful for research
on new plant species
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Disadvantages
evil leaders hoping to clone themselves
religious leaders raised moral
questions
animal clones may develop
the illness of older animals
animal clones may die younger than
donor animals
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Advantages
cloning
Disadvantages
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using cloning to cure
serious illnesses
1
help save endangered
animals
produce plants of
similar quality for sale
2
3
evil leaders hoping to
clone themselves to
attain their ambitions
1
2 religious leaders raised
moral questions
3 a n i m a l c l o n e s m a y
develop the illness of
older animals4
4
Express your ideas
Are you in favor of cloning or against cloning?
State your point of view on it.
The expressions below
may be helpful to you.
Those who agree ... think ...
People who are against ... think ...
Some people hold the opinion that it is
good to ... because ...
Some people think ..., while others argue
that ...
On the one hand, ..., on the other hand, ...
On the contrary, some people think ...
Firstly / First / First of all ... Secondly /
Second ... Lastly / Last but not least ...
As far as I am concerned / In my opinion, ...
As a coin has two sides, everything
has two aspects. On one hand, if
cloning is used in a correct way it can
bring many convenience to us. On the
other hand, if cloning is used in an evil
way it can cause much trouble.
Therefore, we should use cloning in a
correct way.
Some are for human cloning because they
think it will help those who aren’t able to
give babies achieve their dreams. Besides,
human cloning helps maintain or save
people’s lives as human cells can be cloned
and used for medical treatments. However,
those who are against it hold the view that
human cloning is against human ethics and
morality. What’s worse, this technology can
be used by evil leaders or terrorists, which
will bring great damage to the world.
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