育种工作的一个重要环节,就是在杂种群体或人工引变群体中进行选择,从中选择合乎需要的理想材料。因为选择效果的好坏直接影响到育种工作的成败,因此如何制定最有效的选择方案提高选择效果,一直是育种工作者关心的重要课题。通常,我们所观察到的只是作物的表现型值。如前所述,由于表现型值中包含有遗传和环境两方面的变异因素,有些在早期世代表现优良的材料可能会随着世代的递增而变劣,因此,直接根据表现型值进行选择不一定得到理想的效果。如果我们用前面的方法把表现型方差中的基因型 An important part of breeding work is to choose among the groups of the hybrid or artificially selected, and select the desired ideal material. Because the selection effect has a direct impact on the success or failure of the breeding work, how to formulate the most effective selection plan and improve the selection effect has always been an important issue that breeders care about. Often, what we observe is only the phenotypic value of the crop. As mentioned earlier, since phenotypic values ​​contain both genetic and environmental variability, some materials that performed well in earlier generations may become worse with increasing generations, so choosing directly from phenotype values Will get the desired effect. If we use the previous method to put phenotypic variance in the genotype