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本文讨论由于基因连锁和“一因多效”引起的两个数量性状间的遗传相关效应,提出了连锁值的概念以统一表达互引和互斥两种连锁相的连锁强度。在不考虑基因型与环境互作及上位性作用的假设下,从理论上分析了自花授粉作物中两个纯系杂交后不同世代(F_2-F_n)及不同交配方式(自交、回交)的两性状的表现型协方差,並将其中的基因型协方差剖分为加性、显性两部分,导出了关于遗传协方差组成的一般通式。受多对多效等位基因同时作用的两数量性状是这些通式的特例。而一般的单一性状的相应方差(协方差),也是这些通式的特例。
This paper discusses the genetic correlation between two quantitative traits due to genetic linkage and “one gene due to multiple effects”. The concept of linkage value is proposed to express the linkage strength of two linkage phases, which are mutual citation and mutual exclusion. Under the assumption of no interaction between genotype and environment and epistasis, the effects of different generations (F_2-F_n) and different mating methods (selfing and backcrossing) ), And the genotype covariance was divided into two parts: additive and dominant. The general formula about the composition of genetic covariance was derived. Two numbers of traits that are simultaneously affected by many pairs of multiple alleles are a special case of these general formulas. The general variance of individual traits (covariance) is also a special case of these general formulas.