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本文系统分析了杂种优势与配合力的统计学关系，给出了通过经典的完全双到杂交试验对各种杂种优势，各种配合力．母体效应和正反交效应等进行最小平方估计的有关数学公式，简单易用。
In this paper, we systematically analyzed the statistical relationship between heterosis and combining ability, and presented all kinds of heterosis and combining ability through the classic complete double crosses. Maternal effect and the reciprocal cross-reciprocal effect of the least squares estimation of the mathematical formula, easy to use.