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花、草、虫、牛、马、猪、羊等生物,都按照一定的规律传宗接代。通过两性细胞结合产生后代的繁殖方式,叫做有性繁殖。扦插、嫁接、细菌一分为二的传宗接代方式,叫做无性繁殖。由一株柳树通过扦插得到的一片柳林,由一株桃树的众多枝条嫁接得到的一批嫁接苗,由一个细菌通过多次一分为二的分裂得到的一群细菌,就叫做无性系(或称无性繁殖系)。无性繁殖和无性繁殖系的外国名称都叫“克隆”(clone)。克隆的特点是利用一个生物体的一部分(包括细胞、组织、器官)可以形成一个完整的个体,同一无性繁殖系内的各个个体遗传基因完全相同。
Flowers, grass, insects, cattle, horses, pigs, sheep and other creatures, according to certain rules of succession. Generation of sexual progeny by sex cells combined breeding method, called sexual reproduction. Cuttings, grafting, bacteriological splitting into two generations, called asexual reproduction. By a willow by cutting a piece of willow forest, from a lot of branches of a tree grafted grafts get a group of grafted seedlings, by a bacteria through a number of divided into two a group of bacteria, called clones Or asexual line). The foreign name of asexual and asexual lines is called “clone.” Cloning is characterized by the use of a part of an organism (including cells, tissues, organs) can form a complete individual, the same clonal line within the individual genetic identical.