克隆史上的首例是科学家在1997年成功克隆羊。取名为多莉的克隆羊以非常规方式孕育而成。然而,她与其母本完全一致,类似于同卵双生。这与采集儿子母亲的DNA后放入另一个女人的已除去其本身DNA的卵细胞中,然后新细胞的在女人体内生长。九个月后女人便产下与其儿子母亲完全一致的男婴。
In the case of cloning, a father is not needed. In the first successful cloning of an animal the DNA molecule had all of the information needed to create a clone, Dolly. The DNA molecules contains the genetic code, which is basically directions for the new offspring. Normally, a new organism gets half of this code from the father and the other half from the mother. When these two cells are joined together they divide millions of times and then grow into the millions of cells which form the body of the animal. Each cell of the body has a copy of the genetic code and all it would need is an egg cell to grow.
克隆不需要父本。第一个成功的动物克隆中,DNA分子携带了克隆羊多莉所需的所有信息。 DNA分子中包含的遗传密码基本就是新生子代的方向。通常一个新的有机体得到父母亲双方各一半的遗传密码。两个生殖细胞结合后经过上百万次分裂生成数百万个细胞,构成了动物体。体内每一个细胞都复制了遗传密码,而它所需要的不过是孕育其生长的卵细胞。
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2020-09-15
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