一、杂交育种原理基因重组,非同源染色体上的非等位基因自由组合。方法(1)两个具有不同优良性状的亲本杂交得到子一代,子一代均表现为显性性状;(2)子一代个体自交得到子二代,子二代性状出现了分离;(3)从子二代中选出符合要求的品种自交;(4)选择后代中不出现性状分离的品种作为 First, the principle of crossbreeding and gene recombination, non-allelic free combinations on non-homologous chromosomes. Methods (1) Two parents with different traits were crossed to obtain one generation, and the one generation showed dominant traits. (2) The offspring of the offspring got offspring of the second generation and the offspring of the second generation showed separation; (3) From the second generation, select the varieties that meet the requirements to be self-crossed; (4) Select the traits that do not appear to be separated in the offspring.