Estimates of gene effects based on analysis of generation mean were obtained for nine traits in three crosses in castor (Ricinus communis L.): SKP-84 x DCS-94, VP-1 x DCS-94 and GEETA x GC-3. The study material includes P1, P2, F1, F2, BC1 and BC2 generations of these crosses.The individual scaling test and joint scaling test indicated that an additive-dominance model was adequate in three traits viz., length of main raceme, number of effective branches per plant and seed index in the cross VP-1 x DCS-94. The analysis showed the presence of additive, dominance and epistasis gene effects for...