Unit 2 Cloning warming up and speaking

Do you enjoy watching TV series ? Have you ever seen Journey To The West ?

What is clone ?

Clone, also called reproduce asexually ( 无性生殖 / 繁殖 ), is the creation of cells or whole animals using DNA from a single “parent”, without using the normal reproductive ( 有性生殖 ) process. The clone has the same DNA to the parent.

clone Natural clone Man-made 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 strawberry twins pendulum orchid( 吊兰 ) natural cloning examples

Man-made cloning examples

the important events in cloning history

In 5000B.C. ( 谷物选种 ) Human Beings began to choose the best seeds from some kinds of crops. That was the beginning of controlling life according to human’s will.

In 1952: Cloning tadpole ( 克隆蝌蚪 ) The American scientists created a copy of tadpole by means of using a tadpole cell. This tiny tadpole has become the first kind of cloning animal.

In 1978: The first case of tube infant ( 试管婴儿 ) appeared. ☆ A British doctor used the sperm （精液） of a man and fertilized( 受精 ) it in a test tube( 试管 ). ☆ Then transplanted( 移植 ) the embryo( 胚胎 ) into the womb( 子宫 ) of a healthy mother. ☆ The first tube infant called Louis appeared.

In 1996, the famous sheep “ Dolley ” was cloned successfully Dolley and the Father of Dolley – Lanwilmut ( 伊恩. 威尔 姆 )

In 1998 A series of things were cloned. The scientists in Hawaii University cloned over 50 mice. Some private institutions ( 协会 ) successfully cloned little oxen.

In 2002, the scientists of A&M University in USA has bred the first cloned cat in the world.

Nowadays : ☆ Cloned dog, mouse, rabbit, goat, ox, pig appeared. ☆ China become the seventh country that has the ability to clone pigs. ☆ China has succeeded in using embryonic （胚胎的） cell to clone many animals.

Quiz

Natural clone Man-made clone strawberry ★ ★ Is it natural clone or man-made clone? identical dogs

Natural clone Man-made ★ cactus ★ twins

T or F questions 1 Clone can be from both natural clone and man-made clone. 2 The sheep, named Kitty was the first successful clone of a mammal( 哺乳动物 ). T 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. 5 A parent can clone a child who is dying of a terminal illness ( 不治之症 ). T F

Enjoy one play Background : A man has lost his left hand, one day his friend tells him the news that a doctor can transplant one new hand for him... The play happens like this … Guessing : What will the doctor say at the end of the play ?

Is cloning good or bad for us ? Advantages Disadvantages Group 1 and 2 Group 3 and 4 Mini-Debate

Are you interested in the topic of cloning ? Do you believe that we will have cloned human soon ? Do you think a cloned human should have human rights ? Do you support medical cloning ? Speaking

Interview about cloning Situation: A reporter from China Daily is interviewing three famous scientists about their opinions of cloning. Do you think it is wise…? What’s your opinion of …? I think you should … I agree with you that … I would never accept …

Please preview reading comprehension and get some information about Dolley Homework