一、概述生物的性状按其性质可分为质量性状和数量性状两大类。遗传学研究表明,无论是质量性状还是数量性状,均受基因支配。不同性状受支配的基因数不同;并且基因数目的多少,决定着该性状的遗传规律。限于目前的水平,不管是影响质量性状的主基因还是影响数量性状的多基因,人们都不能直接观察,只能根据一些特定的试验,采取一定的统计学方法,间接地获得有 First, an overview of biological traits by nature can be divided into two categories of quality traits and quantitative traits. Genetics studies show that, whether it is quality traits or quantitative traits, are subject to the genetic. Different traits are dominated by the number of different genes; and the number of genes determines the genetic law of the traits. Limited to the current level, whether it is the main gene affecting the quality trait or the multigene affecting the quantitative trait, one can not directly observe it, and can only adopt certain statistical methods according to some specific tests and indirectly acquire