The Akaike information criterion (AIC) difference between the diploid model and the tetraploid models assuming double reduction values from 0 to 0.25. The AIC values were obtained from ASReml 3.0.
The estimated narrow-sense heritability for firmness assuming disomic inheritance and tetrasomic inheritance with increasing coefficients of double reduction.
Correlation of breeding values for firmness estimated assuming disomic and tetrasomic inheritance with w = 0.15.
In order from left to right, pedigree depths of 5, 10, 20, and 30 yr and their influence on the estimated amount of double reduction for each trait.