杂交种是利用杂种优势,它是杂合基因型,必然发生分离,因此必须年年制种.在育种上所说的品种,它是纯合基因型,后代不发生分离,可以稳定遗传,能够连续做种子,例如白鹤玉米、191高粱、大黄谷子等.品种间杂交育种,是在人工控制下不同品种之间杂交,通过一系列育种程序,选育出新品种.育种实践证明,品种间杂交育种是最有成效的育种方法,只要对亲本的性状遗传规律研究清楚,正确选择亲本,就会选出预期的品种.如菲律宾水稻、墨西哥小麦,我省广泛种植的大豆铁丰18等. Hybrids is the use of heterosis, it is a heterozygous genotype, the inevitable separation, it must be planted year after year. Breeding said the species, it is homozygous genotypes, offspring does not occur separation, stable genetic, can Continuous seeds such as Crane Crane, 191 Sorghum, Rhubarb, etc. Cross breeding between varieties is under artificial control of different varieties of hybrids, through a series of breeding programs, breeding new varieties breeding practice proved that the cross between varieties Breeding is the most effective method of breeding, as long as the genetic traits of the parents of the study clear, the correct choice of the parents, will choose the expected varieties, such as the Philippines rice, Mexican wheat, soybeans widely planted in our province 18 and so on.