Assuming that epistatic genetic effects are negligible, the variance component associated with the female effect (GCA) is 1/4 of the additive genetic variance, and the variance component associated with the cross effect (SCA) is 1/4 of the dominance variance. If the experiment were established in one environment, these variances may also include contributions due to confounded genetic-by-environment variances. Variance associated with reciprocal GCA effects (female.r, σ2 GCAr) can be due to maternal effects and cytoplasmic genetic effects that are shared among all crosses with a common female parent, but not shared by crosses where that parent is used as male. The reciprocal SCA variance (cross.r, σ2 SCAr) is due to any effects that are specific
to a particular direction of a specific cross; this could occur due to interactions between cytoplasm of the maternal parent and nuclear alleles of the paternal parent.
Assuming that epistatic genetic effects are negligible, the variance component associated with the female effect (GCA) is 1/4 of the additive genetic variance, and the variance component associated with the cross effect (SCA) is 1/4 of the dominance variance. If the experiment were established in one environment, these variances may also include contributions due to confounded genetic-by-environment variances. Variance associated with reciprocal GCA effects (female.r, σ2 GCAr) can be due to maternal effects and cytoplasmic genetic effects that are shared among all crosses with a common female parent, but not shared by crosses where that parent is used as male. The reciprocal SCA variance (cross.r, σ2 SCAr) is due to any effects that are specificto a particular direction of a specific cross; this could occur due to interactions between cytoplasm of the maternal parent and nuclear alleles of the paternal parent.
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