Rice is one of the crucial staple food crops and its unique grains assist to hold two third of world population. Generation mean analysis is commonly used in studies of inheritance of quantitative traits. Experimental material consisted of ten parents which included six high yielding varieties used as female parents and four traditional landraces used as male parents, F1, F2 and F3 generation of six crosses viz., IR 72 x Veeradangan, ADT 39 x Kavuni, ADT 45 x Kavuni, ADT 43 x Navara, ASD 16 x Navara and

TPS 4 x Kathanellu. Seven biometrical characters indicated that additive and dominance x dominance gene actions were predominant with duplicate type of gene action for fi ve biometrical characters viz., plant height, number of productive tillers per plant, panicle length, number of fi lled grains per panicle and single plant yield. The epiststic eff ects, additive x additive [i] and dominance x dominance [h] were highly signifi cant in most cases. The signs of (h) and (l) were opposite in all studied traits for most crosses. Non-allelic gene interaction was operating in the control of genetic variation in most studied traits. Also, the inheritance of all studied traits was controlled by additive and non-additive genetic eff ects, but dominance gene eff ects play the major role in controlling the genetic variation of the most studied traits. Present study indicated that early generation selection is eff ective and should be

practiced for future breeding program.