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Unit 2 Cloning

By Geraldine Ruiz,2014-09-29 12:07
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Unit 2 Cloning

Unit 2 Cloning

    Teaching aims:

    1To develop reading ability.

    1. To practise some specific reading skills.

    2. To know something about cloning.

    Warming up ( 5ms )

    Dolly is an example of _________ clone

    The twins are _________clones

    What is cloning?

    It is a way of making an exact copy of another animal and plant. Reading I Skimming

    Read the text fast and try to finish the exercise on the paper Choose the right answer according to the text.

    1.Dolly the sheep_____. B

     A. looked exactly like the sheep that provides the egg.

     B. was the exact copy of the sheep that provides the nucleus.

     C. looked like the sheep that gave birth to it.

     D. had the characteristics of all three sheep.

     2. It can be inferred from the passage that a cloned animal_____.C

     A. usually lives as long as the original one

     B. usually lives longer than the original one

     C. usually lives shorter than the original one

     D. is usually as healthy as the original one

    3. The cloning of Dolly the sheep succeeded because____. B

    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. Which of the following is not an advantage of cloning?D

    A. Cloning can be used for medical purposes.

    B. Large quantities of food can be produced by cloning.

    C. Cloning can help keep animals from becoming extinct.

    D. Famous persons who have passed away can be cloned. Reading II Detail reading ( 8ms )

    Read the text again and find out the problems of cloning

     1. Animal clones may develop the illnesses of older animals. .2 Animal clones may die younger than the donor animals. 3Evil leaders may want to clone themselves.

    4. There are moral objections tocloning human beings.

    Read the text again and find out the advantages of cloning

    1. Medical cloning could produce cures for serious illnesses in humans. 2Cloning plants can produce plants of similar quality for sale.

    3. Cloning plants can be useful for research on new plant species.

4. Cloning can help save endangered animals

Reading III Intensive reading (7ms )

    Read the letter again, then try to find the main idea of each paragraph. 1.Cloning is ______________________________

    2.Cloning has ____________ uses.

    3.The _________ of Dolly.

    4. The ________ of Dolly.

    5. It is __________ to clone human beings.

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

    2two major 3problems 4effect 5 forbidden

Practice activity ( 8ms

    Press conference about cloning

    (关于克隆的记者招待会)

    Some students will act as biologists

    Other students will act as reporters.

    Reporters should think out some questions you are interested in or you want to know most to ask these scientists.

Skimming

    Please read the passage quickly and get the main idea, and then finish the following exercises in groups.

    1. The main idea of the text is____ D

     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. The cloning of Dolly the sheep succeeded because____. B

    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

    What is people's fear about human cloning. Which of the following is wrong? D A. Cloned Hitlers would do harm to the world.

    B. Cloned people may be killed at will for medical aid.

    C. A woman would have difficulty recognizing her real husband.

    D. Men will die out because a woman can give birth to a baby without a husband. The sheep that donated the somatic cell most probably lived ____ years. D A. 3 B. 6 C. 9 D. 13

    5. We can infer from the last three paragraphs that ___.C

    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. There were arguments about animal cloning and concerns about the future of cloning.

    D. Dolly successfully cloned a new lamb with the help of cloning scientists

Reading

    The main idea of each paragraph

    1.Cloning is ______________________________

    2.Cloning has ____________ uses.

    3.The _________ of Dolly.

    4. The ________ of Dolly.

    5. Peoples to cloning.

    Para 1 The definition of cloning

    What is cloning ? Cloning is a way of making an exact copy of another animal and plant. It happens both in ______ and in_______. They can be cloned by ________ and _______.

Para 2The 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

    In this paragraph, the word “straightforward” means ____. A

    A. uncomplicated B. honest C. frank D. difficult

Para 3The problems of Dolly

    At first, the fact that Dolly developed ______ in a natural way was __________. Later, the news _____Dolly had become seriously ill was __________. Finally, the problem that occurred to the scientists was that a cloned animal lives _____________ the original one.

    as long as / shorter than / longer than

Para 4The impact of Dolly

    Its appearance raised and the media and public imagination.

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

     A. . complicated B. arguable C. important D. traditional

Para 5Peoples reaction to cloning

    True or false:

    1 People feared that Cloned Hitlers would do harm to the world. T 2 All the research into human beings will be forbidden. F

    3 Some countries will use cloning in a wise way. T

The writers attitude towards cloning A

    A. Objective (be fair)

     B. Negative (be against it)

     C. Positive (be in favor of it)

Because_________________________________________________________________

    Fill in the chart about the advantages and disadvantages of cloning. Collecting information

    Disadvantage(bad points) Advantage(good points)

     Cloning is beneficial to Animals clones get ill and

     It can make more profits for Against nature

     We could use cloning to cure Animals clones may develop the illness of

     Cloning can help save Evil leaders may want to

     Cloning can provide a copy of a child for a People are afraid that scientists will create

    couple thousands of copies of the same person.

Practice activity: Debate

    Are you in favor of cloning or against cloning? State your point of view on it.

    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,

     支持者认为克隆利大于弊!克隆技术是21世纪人类科学的伟大突破。人类可以利

    用克隆技术培养大量品质优良的动植物(挽救珍奇濒危动物(调节大自然的生态平

    衡(可以研制高水平新药解决人类各种疾病等。

     反对者认为克隆会导致动物早衰、夭折(无计划的克隆动物会破坏生态平衡!导致

    一些疾病的传播;邪恶分子可能克隆自己!给人类带来灾难等。

1996 cloning sheeps

    2001 cloning cattle

    2002 cloning cats

    我国成功繁殖克隆兔 体形要比普通兔大许多

    20025月中旬成功地繁殖了一只胚胎细胞克隆兔。

第一只克隆宠物猫

    克隆马及其母亲兼姐姐

    20024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()和正常小猪()

Reading I Scanning

    Write the letter “T”if the statement is true. Write “F”if it is false.

    1.Cloning means making a copy of an animal or a plant.F

    2.Gardeners can make a lot of money by cloning plants.T

    3.Cloning animals is as complicated as cloning plants. F

    . Dolly the sheep was the first successful clone of a mammalT

    5.Natural clones happen in animals as well as in plants.T

What’s the text mainly about?

    It’s mainly about cloning arguments about animal cloning and concerns

    about its future.

    Step2 Read again and find the main ideas of the five paragraphs?

    Para 1:What’s cloning? ( It is a way of making an exact copy of another animal and plant

    Cloning has two major uses.

    The problems of Dolly.

    The effect of Dolly.

    It is forbidden to clone human being.

    Cloning is a way of making an exact copy of another animal or plant.It can be divided into natural clone and man-made clone. A natural clone is one that occurs in nature and a man-made clone is one that is procured through human intervention(介入!干预).

Organization ( first reading)

    ___1___ What is the cloning.

    ___2___ Two major uses of cloning.

    ___3___ The birth and death of Dolly. _4 5_____ Controversy brought by Dolly .

    Choose the right answer according to the text.

    1. The main idea of the text is____ D

     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 cloning of Dolly the sheep succeeded because____. B

    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

    The sheep that donated the somatic cell most probably lived ____ years. D

A. 3 B. 6 C. 9 D. 12

    4. We can infer from the last three paragraphs that ___. D

    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 about animal cloning and concerns about the future of cloning.

Third reading -----"True" or"False"

    1. Cloning means making a copy of an animal or a plant. F

     2. Gardeners can make a lot of money by cloning plants. T

    3. Cloning animals is as complicated as cloning plants. F

    4. Dolly the sheep was the first successful clone of a mammal. T

    5. Natural clones happen in animals as well as in plants. T

    1. In the second paragraph, the word “straightforward” means ____.A

    A. uncomplicated B. honest C. frank D. difficult

    2. It suddenly opened everybody’s eyes to the possibility of using cloning to cure serious illness and even to produce human beings. (translation) 因为它突然打开了人们的眼界!看

    到了有可能利用克隆技术来治疗重病!甚至还有可能克隆出人类。

    3. In an unfortunate way , the mice and Dolly sheep had no choice but to die young. No one imagined that this would happen and so no one could prevent it.(Find a sentence which has the similar meaning) A

     4,What is the writing style?

    A. Expositive ?说明性的, B.Descriptive

    C. Argumentative ?议论性的, D. Narrative

     The writer’s reaction towards cloning is____ C

    A. Positive B. Negative C. neutral

    Learning tips:

    The passage is written in the expositive style. That is to say the text is in the third person and in factual and formal language. It gives different points of view and does not try to persuade the reader to make up his/her own mind.

    Text1

    With respect to(关于) politics, seven developed countries announced a temporary ban on human cloning in 1998, which is still in force.

    Text2

    A controversial doctor in America has claimed to have cloned human embryos and transferred them to four women prepared to give birth to the first

    cloned babies.

    From the two texts we can see that some people ___ are against the human cloning while others___ are for it.

    Consolidation

    Clone is a way of making an exact_______ of another animal or plant. Cloning have two ______ uses. Firstly, gardeners use it all the time to produce _____________quantities.

    Secondly, it is valuable for research on new plant _________and for medical research on animals. But through the _________and death of Dolly, cloning has a lot of problems. On the

    other hand, we know cloning is controversial in some countries for ________and ___________reasons.

    Homework

    1. Read the passage again and find out all the noun clauses in the text.

    2. Write a short passage according to the following topic.

     Should human cloning be allowed?

Step 1: Prediction

    What do you think the article is about by reading this headline? Step 2: Scanning

    1,What is the main topic? A

    A.Cloning. B.Dolly the sheep . C.It will lead us to some places.

2,What is the writing style? A

    A. Expositive. B. Descriptive. C. Argumentative.

    scanning

    Para1

    1. How do gardeners clone plants?

    Para2

    1.What two major uses do cloning have?

    2. How many female sheep participate in the cloning of a new sheep? Do you know about:

    The procedure works of a sheep?

    Para3

    What problems do Dolly have?

    She became seriously ill and her illnesses were more appropriateto a much older animal. Dolly lived for six years,half the length of the life of the original sheep. Para4

    1.whats the effect of Dolly?

    Para5

    1.whats your opinion of cloning

Warming up ( 4ms )

    Answer the following questions:

    1. Do you like dinosaurs? Where have you seen them? Can you see them in our real life? Why?

    2. Do you think it is possible to clone dinosaurs? If yes, do you think thats good for human

    beings? Why?

    Reading -- I scanning ( 5ms )

    Read the text, then tell the following sentences are true or false. ( Students can discuss in pairs. )

    1. Scientists are still experimenting with cloning mammals because they think it can

    make money. F

    2. The animals that have disappeared from the earth, like dinosaurs, can be brought

    back to life through cloning. F

    3. If we can clone any extinct animals, we should let them live in a zoo. F Reading -- II Detail reading ( 6ms )

    Read the text, then answer the following questions. ( Students can discuss in pairs. )

    1. Why should’t you clone an extinct animal unless there is enough diversity in the

    group?

    There will not be enough genetic variation in the group to be able to resist new illnesses.

    2.Why is it wrong to clone an extinct animal if it would have to live in a zoo?

    It is not a good idea to clone an animal that would have to live in a zoo because it is not a

    suitable habitat to develop and increase its numbers.The zoo is not a natural

    environment for a wild animal.

    3.Why can’t you clone the DNA of animals that have been extinct longer than 10,000 years?

    The DNA of animals more than 10,000 years old is not suitable for cloning ,for it can’t survive so long.

Reading -- III Argument ( 10ms )

    1. Read the passage again and have a argument according to the requirement of Ex.2 on Page 16.

    2. Students work in groups, when discussing, the head of each group should write down the opinions of all the members.

    3. Ask some volunteers to show their opinions.

Warming up

    Answer the following questions:

    1.Have you ever seen the film Jurassic Park?

     Do people like this film?

     What animals do you see in the film?

     Are they real dinosaurs?

    2. Do you like dinosaurs? Can you see them in our real life? Why?

    Reading -- I scanning ( 5ms )

    Read the text, then tell the following sentences are true or false. ( Students

    1. Scientists are still experimenting with cloning mammals because they think it can

    make money. F

    2. The animals that have disappeared from the earth, like dinosaurs, can be brought

    back to life through cloning. F

    3. If we can clone any extinct animals, we should let them live in a zoo. F Give some reasons why it is either impossible or unsuitable to clone extinct animals Reason 1:You need perfect DNA

    Reason 2There is not enough diversity for cloned animals to overcome new diseases. Reason3It would be unfair to clone any extinct animals if they would have to live in a zoo. Diversity in a group of cloned animals

    Advantage of diversity Disadvantage of diversity

     If there is a new illness some of They would all have the same

    these animals may die ,but arrangement of genes and so they might

    others will survive and passed on all die of the same disease.

    the ability to resist that disease to

    their children.

Reading -- II Detail reading ( 6ms )

    Read the text, then answer the following questions. ( Students can discuss in pairs. )

    1. Why should’t you clone an extinct animal unless there is enough diversity in the

    group?

     There will not be enough genetic variation (遗传变异)in the group to be able to resist

    new illnesses.

    2. Why is it wrong to clone an extinct animal if it would have to live in a zoo? It is not a good idea to clone an animal that would have to live in a zoo because it is not a suitable habitat to develop and increase its numbers.The zoo is not a natural environment for a wild animal.

    3Why can’t you clone the DNA of animals that have been extinct longer than 10,000 years?

    The DNA of animals more than 10,000 years old is not suitable for cloning ,for it can’t

    survive so long.

Careful reading

    People interested in Not only film makers but also ______________ .

    _______ for its impossibility Perfect DNA is needed.

    • There is not enough ________ in the group. A (n)

    ______________ would be needed for the cloned extinct

    animals.

    __________ The chance of dinosaurs returning to the earth is

    ______________ .

Post-reading

     The writer of the text _____. C 1.

     A. is excited by the possibility of cloning fierce and extinct animals

     B. believes that extinct animals can be brought back to life by cloning

     C. thinks it impossible or unsuitable to clone extinct animals like dinosaurs

     D. dreams of dinosaurs returning to the earth

    2Which of the following is true?____D

    A. Mice were cloned in 1983.

    B. Dolly the sheep was the first cloned animal.

    C. The name of the cloned cow is “Bison”

    D. China was successful in cloning twin calves.

    3.Which of the following is true?____D

    A. Mice were cloned in 1981.

    B. Dolly the sheep was the first cloned animal.

    C. The name of the cloned cow is “Bison”

    D. China was successful in cloning twin calves.

    4The reasons why a group of cloned animals all die of the same illness do NOT include__ C

    __.

     A. they have the same arrangement of genes

    B. there isn’t enough diversity in the group for it to overcome illnesses

     C. the illness is a new one

     D. their arrangement of genes can not resist that new disease 5. We can infer from the text that____ B A. scientists are experimenting to clone dinosaurs

    B. dinosaurs will never return to the earth

    C. cloned animals will only live in the zoo

    D. the DNA of dinosaurs can only survive 10, 000 year

     5.research using the embryos of mice

     4. 8.first experimental clones of cows

     8.first experimental clones of mice

     7.work on the embryos of sheep and mice

     2.China’s first cloned twin calves

     3.cloing of frogs

     6.first clone of a mammal

     1.cow gave birth to a bison

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