Table 8 Examples of additive and dominance maternal effects
Offspring genotype
LLSLLSSSMaternal litter average
A. Expected week 1 weights from the mixed model (in standardized units) of offspring as a function of their genotype and the genotype of their mothers at mebs18.1a
Maternal genotype
 LL–0.15–0.28–0.21
 LS,SL–0.06–0.05–0.11–0.25–0.12
 SS0.410.280.34
Offspring average–0.10–0.170.15–0.01
B. Expected week 4 weights from the mixed model (in standardized units) of offspring as a function of their genotype and the genotype of their mothers at mebs8.1b
Maternal genotype
 LL0.150.070.11
 LS,SL–0.14–0.19–0.43–0.30–0.26
 SS0.290.150.22
Offspring average0.00–0.06–0.07–0.07
  • Table cells with an em dash indicate combinations of material and offspring genotypes that cannot occur under Mendelian inheritance.

  • a This locus has a strong additive maternal effect (standardized am = −0.36 from the linear model, but it is calculated as −0.35 from these cell means) and no direct effect.

  • b This locus has a strong dominance maternal effect (standardized am = −0.43 from the linear model, but it is calculated as −0.49 from these cell means) and no direct effect.