The philosophy of intrapopulation combined selection is the search for and identification of individuais with superior genotypic behavior, based on their performance compared to the family mean and, at the same time, of their family mean in relation to the population mean, through the weighting of the phenotypic values represented, respectively, by the within and among families heritability coefficient. The objective of this study was to adapt and apply this philosophy to diallel analysis. The

more »

... rosses were considered as having fixed effects and selected on the basis of their specific combining ability (SCA), and on the mean performance of the two involved parents, in relation to the general combining ability (GCA). This work was based on Griffing's (Heredity 10: 35-50, 1956) method 2, model1 which involves p(p + 1)/2 treatments. The proposed index resulted from the weighting of the effects of GCA (grs) and SCA (Sij's) by the respective determination coefficients of additive and dominant genetic deterrninatíons, resulting from the partitioning of the total genotypic determination coefficient. An example is given for ilIustration.