選修八 2.7Unit 2　warmingup

1、新課標(biāo)人教版課件系列 高中英語 選修選修( (模塊）模塊）8- 8-2.7 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 ( 無無 性生殖性生殖 /繁殖繁殖) , is the creation of cells or whole animals using dna from a single “paren

2、t”, without using the normal reproductive (有性生殖有性生殖) process. the clone has the same dna to the parent. clone natural clonenatural clone man-made cloneman-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 produc

3、ed through human intervention(介入介入) . cactus strawberry twins pendulum orchid(吊蘭吊蘭) natural cloning examples man-made cloning examples the important events in cloning history in 5000b.c. ( 谷物選種谷物選種) human beings began to choose the best seeds from some kinds of crops. that was the beginning of contr

4、olling life according to humans will. in 1952: cloning tadpole ( 克隆蝌蚪克隆蝌蚪) 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 (試管嬰兒試管嬰兒 ) appeared. a british doctor

5、used the sperm（精液）（精液）of a man and fertilized(受精受精 ) it in a test tube(試管試管). then transplanted(移植移植) the embryo(胚胎胚胎) into the womb(子宮子宮 ) 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 lan

6、wilm ut ( 伊恩伊恩.威爾威爾 姆姆) in 1998 a series of things were cloned. the scientists in hawaii university cloned over 50 mice. some private institutions ( 協(xié)會協(xié)會 ) 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

7、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）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 clo

8、ne 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(哺乳動物哺乳動物). t f 3 only strawberries and cactus(仙人仙人 掌掌) are natural clones . f 4 since dolley ,researcher have cloned a number of l

9、arge 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 ( 不治之癥不治之癥). 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

10、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

11、 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 wisedo you think it is wise? ? whats your opinion of whats your opinion of ? ? i think you should i think you