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建立人际资源圈Cloning_into_the_Future
2013-11-13 来源: 类别: 更多范文
Cloning into the Future
Summary
Clone is an organism, or group of organisms, derived from another organism by an asexual (nonsexual) reproductive process. The word clone has been applied to cells as well as to organisms, so a group of cells stemming from a single cell is also called a clone. Usually the members of a clone are identical in their inherited characteristicsthat is, in their genes except for any differences caused by mutation. Identical twins, for example, who originate from the division of a single fertilized egg, are members of a clone; whereas non-identical twins, derived from two separate fertilized eggs, are not clones.
Through recent advances in genetic engineering, scientists can isolate an individual gene (or group of genes) from one organism and grow it in another organism belonging to a different species. This technique is called cloning because it uses clones of organisms or cells. It has great economic and medical potential and is the subject of active research (Clone).
Introduction
The idea of cloning came about in the early 1900s. A German scientist named Hans Spemann first thought of the cloning methods around 1938. One of the first attempts on cloning, however, was by a scientist named Adolph Eduard Driesch.
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