数量性状杂交F_2代以及回交后代方差组成的新模型

A NEW MODEL OF THE VARIANCE CONSTITUTIONS IN F_2,B_1 AND B_2 GENERATIONS OF QUANTATIVE CHARACTERS

对数量性状杂交Ｆ＿２代以及回交后代的方差组成进行了讨论，提出了现有模型的不足，同时考虑了非等位基因相互作用下Ｆ＿２、Ｂ＿１和Ｂ＿２代的方差组成情况，给出了一个简化的数学表达式。

The variance constitutions inF_2,B_1and B_2generations of quantitative character were discussedand the deficiency of present models was also pointed out by the author;Considering the variance con-stitution of F_2,B_1 and B_2 generations in condition of epistatic interaction of non-allele,the author putforward a simplified mathematic formula.