课件62张PPT。高中英语译林2003课标版必修五Unit 3 Science and nature
Welcome to the unit
第1课时(共1课时)The History of Everything
--Theme song of
The Big Bang TheoryOur whole universe was in a hot dense state, Then nearly fourteen billion years ago expansion started. Wait...
The Earth began to cool,
The autotrophs began to drool,
Neanderthals developed tools,
We built a wall (we built the pyramids),
Math, science, history, unraveling the mysteries,
That all started with the big bang!Step 1
Leading-inWhat advantages have science brought to us?solar energy(太阳能)rocket(火箭)Science is developing so fast
that it is beyond our imagination. clone (克隆)cell [sel] 细胞What is cloning?Cloning isproducing an exact copy(复制品) of a plant or an animal using its cells(细胞).
Scientific definitionCloning is the creation of cells or whole
animals by using DNA(脱氧核糖核酸)
from a single “parent”, bypassing
(绕道而行) the normal reproductive
(生殖的) process. The clone has the same DNA to the “parent”.Listening :
Cloning Dolly The Sheep In⑴ ____, Dolly became the first ⑵______ ever to be cloned artificially from another ⑶_____ sheep, proving once and for all that even adult cells ⑷_______ the necessary information for creating each part of an⑸ ______ organism. Let’s see how. Using⑹ _____surgery, scientists first ⑺_______the nucleus from an unfertilized egg of an adult sheep. A ⑻________other cell was then taken from a 6-year-old youth. The nucleus from the cell was ⑼_______ into the empty unfertilized egg. The egg now contains a complete set of ⑽_____ from the adult sheep’s cell. After implantation into another sheep, it grew into a complete new⑾________. Dolly is an exact genetic⑿ ____, a clone of the other sheep that ⒀________the cells. In creating Dolly, the scientists proved that adult ⒁ ____ carrying workable versions of all genes necessary to ⒂_______ an entire new organism. They proved it was possible to clone a whole new organism from adult cell. So if it can be done on sheep, can it be done on humans? Is it possible to clone another me? A mini me perhaps. Well, scientists believe that cloning humans is possible but ⒃ _______very difficult. It took⒄ ____ attempts to produce Dolly. Nevertheless, providing the technique can be refined to work in other species and more ⒅_______, the cloning of Dolly does have ⒆_______ implications for the future of ⒇________and medicine, and for the future of the human species.
In⑴ ____, Dolly became the first ⑵______ ever to be cloned artificially from another ⑶_____ sheep, proving once and for all that even adult cells ⑷_______ the necessary information for creating each part of an⑸ ______ organism. Let’s see how.1997mammaladultcontainentire Using⑹ _____surgery, scientists first ⑺_______the nucleus from an unfertilized egg of an adult sheep. A ⑻________other cell was then taken from a 6-year-old youth. The nucleus from the cell was ⑼_______ into the empty unfertilized egg. The egg now contains a complete set of ⑽_____ from the adult sheep’s cell. microremovedcompleteinsertedgenes After implantation into another sheep, it grew into a complete new⑾________. Dolly is an exact genetic⑿ ____, a clone of the other sheep that ⒀________the cells. In creating Dolly, the scientists proved that adult ⒁ ____ carrying workable versions of all genes necessary to ⒂_______ an entire organism. individualcopydonatedproducecellsThey proved it was possible to clone a whole new organism from adult cell. So if it can be done on sheep, can it be done on humans? Is it possible to clone another me? A mini me perhaps. Well, scientists believe that cloning humans is possible but ⒃ _______very difficult. It took⒄ ____ attempts to produce Dolly. technically277 Nevertheless, providing the technique can be refined to work in other species and more ⒅_______, the cloning of Dolly does have ⒆_______ implications for the future of ⒇________and medicine, and for the future of the human species.
efficientlymassivebiologyCloning Dolly The SheepStep 2
Picture-
presenting Cloned Animals!Hello, I’m Dolly. I am the world’s first cloned mammal.[‘m?m?l]
哺乳动物What do you know about Dolly?the world’s first cloned mammal
created by Scottish scientists in 1996
died in 2003 because of lung disease
many countries have banned human
cloning since Dolly’s birthI look just like my brother, that’s because I am a clone. n.克隆体;复制品I was created using a cell from an adult cat.The kitten in the picture is called Cc. Its name is from “Copycat”. Scientists in the USA created it with a cell taken from its mother, Rainbow. It was born in December 2002.We are five cloned female pigs and we were born on Christmas Day 2001.[‘fi:meil]
adj.雌性的We are a pair of new-born cloned calves from Japan./ ka:vz / 小牛犊I am the first cloned monkey and I was born at a research centre in the USA.Do you know any other cloned animals?绵羊:1996年,多利(Dolly)
猕猴:2000年1月,Tetra,雌性
猪:2000年3月,5只苏格兰PPL小猪;8
月,Xena,雌性
牛:2001年,Alpha和Beta,雄性
猫:2001年底,CopyCat(CC),雌性
鼠:2002年Do you know any other cloned animals?兔:2003年3-4月分别在法国和朝鲜独立实现;
骡:2003年5月,爱达荷Gem,雄性;6月,
犹他先锋,雄性
鹿:2003年,Dewey
马:2003年,Prometea,(普罗米修斯)雌性
狗:2005年,韩国首尔大学实验队,史纳比
猪:2005年8月8日,中国第一头供体细胞克
隆猪Do you think the cloned animals are as healthy as the natural ones?We don’t actually know. Some early evidences suggest that clones may have health problems and that they may age prematurely(早衰地).Step 3
DiscussingOral Task One: Pair workIf you were a scientist, what do you want to clone? Why? Discuss with your deskmate.endangered animals
(濒危动物)food humans If cloning goes wrong, what will happen?Hippogriff
鹰头马身有翼兽 Fun picturesA dog or an eagle?Centaur
马人Fun picturesIf cloning goes wrong, what will happen?A dog or an eagle?A duck or a crocodile?A cock or a dog?A lion or a kangaroo?A frog or a crocodile?A tortoise or a bear?A bird or a dog?A man or a dog?Do you think it is a good idea to clone humans one day? Why or why not?Oral Task Two:DebateAre you for or against cloning humans?
Write an article to state your idea.Homework
Thank you!