一个生物体的后代具有同一遗传组成的叫做无性繁殖系;典型的无性繁殖系的个体,不仅相互之间相似,而且在遗传特性上重现母本类型。在育种工作中无性繁殖方法可以解决现有的任何杂交系都难以解决的问题:获得某些创高产的优秀动物的遗传复制品。掌握无性繁殖方法将对整个动物饲养业产生革命性影响。在鱼类进行自然雌核生殖的一切场合,都存在无性繁殖系。已知鱼类雌核生殖类型有五种,我国(苏联)淡水水域中的银鲫是其中之一。用雌核生殖法繁殖时,进入卵细胞的精子只起发育刺激素的作用,它所带的父染色体,在卵细胞的原生质中被破坏掉,胚胎的进一步发育全在母本遗传性的控制下进 Descendants of one organism have the same genetic make-up called clonal lines; individuals of a typical clonal lineage not only resemble each other but also reproduce the genetic pattern of the female parent. Asexual breeding methods in breeding work can solve the problem that is difficult to solve with any existing hybridization line: to obtain a genetic replica of some of the highest yielding excellent animals. Mastering asexual reproduction will have a revolutionary impact on the entire animal husbandry industry. In all cases of natural gynogenetic reproduction of fish, there are clonal lines. There are five known types of fish gynogenetic reproduction, one of which is silver crucian carp in the freshwater waters of our country (the Soviet Union). When gynogenetic is used, the spermatozoa entering into the egg cells only function as the developmental stimulating hormone. The parental chromosomes it carries are destroyed in the protoplasm of the egg cells and the further development of the embryo is under the control of the heritability of the female parent