AbstractIn this paper the analysis of genotypes obtained in a diallel crossing system, including parents, one set ofF1′s and reciprocalF1′s, is given. This analysis is presented for data obtained from the experiments carried out in a block design in which block effects are random. The analysis of variance, estimators of reciprocal effects, estimators of general and specific combining abilities are considered. Also statistics for testing hypotheses concerning some genetical parameters are gi