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《Warming up、Pre-reading、Reading、Comprehending》新课标PPT课件优质课下载
impact
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level
future
定义
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原理
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前景
说明文
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 produced through human intervention(介入) .
Background:
AD5000:grain seed selection
(谷物选种)
In 1952:Clone tadpole(克隆蝌蚪)
In 1972: Gene replication (基因复制)
In 1978: 1st test-tube baby(试管婴儿)
In 1997:1st mammal Dolly(多利羊)
In 2000:Clone monkey
(人类近亲被克隆)