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《Using LanguageⅠ》最新PPT课件优质课下载
the development of cloning
In 1952 tadpole
(蝌蚪） was cloned . It is the first animal to be cloned.
1978年7月25日,世界上第一个试管婴儿路易丝·布朗在英国出生
路易丝·布朗现已39岁 .
In 1996, a sheep called Dolly was born. It is the first mammal to be cloned. It is considered to be the greatest success in the development of cloning.
A macaque （猕猴）was cloned in 2000. Later scientists cloned many monkeys .
Mules (骡子） have no ability to give birth to a baby. A mule was cloned in 2003. It is the first animal which lack fecundity (生育能力）to be cloned.
1950s cloning of frogs
1970s research using the embryos of mice
1979 work on embryos of sheep and mice
1981 first experimental clones of mice
1983 first experimental clones of cows
1996 first clone of a mammal:Dolly the sheep
2000 cow gave birth to a bison
2001 China’s first cloned twin calves
2002 first cloned cats
first cloned dog...
Using language
霸王龙 tyrannosaurus
剑龙 stegosaurs
雷龙 brontosaurus
翼龙pterodactyl
The return of Dinosaurs?
(P15)