Transcript 2 - DriveHQ

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 manmade. Explain how they differ.
A strawberry plant
Growing
new plants
Twins
Dolly the
sheep
How does Dolly differ from other sheep?
She was cloned while the others were born
naturally.
cloned sheep.
Dolly was a ______
1996
cloning sheeps
2001 cloning cattle
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
第一只克隆宠物猫
克隆马及其“母
亲兼姐姐”
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 is cloning ?
Cloning is a way of making an
exact copy of another animal
and plant.
Pre-reading
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
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.
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 or F questions
1 Clone can be from both natural clone
and man-made clone .
T
2 The sheep, named Kitty was the first
successful clone of a mammal(哺乳动物).
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 .
T
5 A parent can clone a child who is
dying of a terminal illness ( 不治之症).
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
plants and
It happens both in ______
animals They can be cloned
in_______.
themselves and _______.
humans
by ________
Natural clone
Man-made clone
What is cloning ?
Cloning is a way of making an
exact copy of another animal and
plant.
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
Para 3
The problems of Dolly
normally
At first, the fact that Dolly developed ______
encouraging
was __________.
that
Later, the news _____she
lived for six years,
orginal one
half the length of the life of the ______
disturbing
was __________.
Finally, a cloned animal lives
_____________ the original one.
shorter than
as long as / shorter than / longer than
Para 4
The impact of Dolly
The word “controversial” in
para 4 probably means
____________.
A. complicated
B. arguable
C. important
Para 5 People’s reaction to cloning
True or false:
1 People feared that Cloned Hitlers would
do harm to the world.
Many
governments
forbade
reserch
2 All
the research
into human
beings
will
into
human beings.
be forbidden.
3 Some countries will use cloning in a
wise way.
The writer’s
attitude towards
cloning
A. Objective (be fair)
B. Negative (be against it)
C. Positive (be in favor of it)
the author does not state
Because____________________________
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 Medical cloning
develop the illness could produce cures
of older animals.
for serious
degenerative
illnesses in humans.
Animal clones may Cloning plants can
die younger than the produce plants of
donor animals
similar quality for sale
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. 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. 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