Transcript 2.How can we clone something?

Cloning
Module 5
What animals have been cloned ?
Dolly
First cloned mule
Cloned
monkeys
First cloned horse
First cloned cat
Free talk
1.What is cloning ?
2.How can we clone
something?
Before Reading
Read these words and decide which
ones you are likely to see in the
passage. （possibly）
acid bacteria embryos
enzyme experience gene
human tissue organism plant
psychological stem cell
structure
upbringing
•
•
•
•
para 1—3
Fast-reading
1. DNA ?
2. Enzyme ?
3. A clone ？
DNA
the fundamental
component of life
enzyme
chemicals formed
in the body
Dolly
5
a clone
an organism which is
genetically identical
to another
Fast-reading
para 4—7
•
• How many possible
reasons for cloning are
mentioned in the passage ?
Four
Para 1
Careful-reading
• 1. who discovered the structure of
1953
Watson
and
Crick
DNA? When ?
•
He understood that both the parent plants
had influenced the genetic make-up of the
2. What did Mendel understand in
new plant.
1866 ？
Para 2&3
Careful-reading
Unzip the DNA
• Find the expressions
Cut out a sequence of
1. 解码DNA
genes
Insert them into the hos
2. 截取一段序列的基因
cell
How can we clone something ?
3. 3. 把它们插入宿主细胞
Cloning takes the DNA from a single cell to
creat a whole individule.
Para 4&5
Careful-reading
Find the expressions
1. 正当的理由
2. 可供选择的治疗
方法
3. 未知的心理压力
4. 选择人生道路
5. 拥有新的缺点
6. 原有的美德
valid reasons
an optional treatment
unknown psychological
pressure
choose a path in life
possess new vices
existing virtues
Valid reasons
(advantages)
As an
optional
Disadvantages
treatment for couples
who find it difficult to
have children
A clone would be
under unknown
psychological
pressure
reproduce the
talents of
exceptional people
A clone may possess
new vices instead of
existing virtues
Para 6--8
Careful-reading
Explain the expressions
1. recover from a
从疾病中康复
disease
repair human tissue
2. 修复人体组织
a price cow
3. 一只优选奶牛
依靠，依赖
4. rely on
5. 限制生物品种的
restrict the biodiversity
多样性
of the breed
6. at a crime scene 在犯罪现场
Valid reasons
(advantages)
To obtain a supply
of stem cells
To help farmers
grow resistant
crops.
Disadvantages
Embryos made from
clones would be
wasted which some
people would find
unacceptable.
To rely on a few
cloned animals or
crops would restrict
biodiversity
Discussion
Is it right to clone human beings ？
Conclusion
Science is a two-edge sword.
Role-play
homework
Surf the Internet to find
more information about
cloning and write a
composition :
My View on Cloning
Tips
You can write as follows:
1. Are you for or against cloning?
2. Give your reasons. Use these
words:
“firstly… secondly… lastly”
3. Give examples to support your
idea.
You can see the example on P 66