摘要： 当两系统存在k对基因差异，P1中增效基因为k-k’对，减效基因k’对时，两纯系杂交回交群体遗传方差加性×显性分量的数学式为F=(k-k’)∑(i=1)d1h1-k’∑(i=1) d1h1.。F的大小决定于显性齐性和基因分散的程度。因此在一般情况下，F的遗传含义是混杂不清的。只有基因完全相联时F=k∑(i=1)d1h1，与Mather 和Jinks 的推导结果一致，这时F反映显性齐性程度。Abstract: Assuming kpairs of different genes between two pure parental lines (P1 and P2), k-k’ pairs of increasing genes and k’ pairs of deereasing genes in P1,the comoponent of additive×dominance in the genetic variance of the backcross generation is represented as F=(k-k’)∑(i=1)d1h1-k’∑(i=1) d1h1.The component F is determined by both the consistency of dominance and the dispersion of genes. In genetral, the genetic implication of the component F is complexity.Only under the situation of complete associates of genes F=k∑(i=1)d1h1，which agrees with the result by Mather and Jinks. In such case, F illustrates the consistency of dominance.
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