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Six × six full diallel mating involving six parents viz., (P1) ADT 37, (P2) ADT 43, (P3) ADT 45, (P4) ASD 16, (P5) CO51 and (P6) CO47 was effected to evolve 30 hybrids in rice crop. The six parents along with their 30 F 1 hybrids were evaluated for ten agronomic traits viz days to 50 per cent flowering, plant height at maturity, the number of productive tillers per plant, panicle length, the number of filled seeds per panicle, seed length, seed breadth, seed L/B ratio, hundred seed weight and seed yield per plant. The traits viz., seed length and seed L/B ratio were controlled by complete dominance. Incomplete dominance was found to operating in the expression of the traits viz., the number of filled seeds per panicle and seed yield per plant. Partial dominance can be had as semi additivity. On the other hand, the traits viz., days to 50 per cent flowering, plant height at maturity, panicle length, seed breadth and hundred seed weight were controlled by over dominance. Apart from this amphi directional dominance was well evidenced from the correlation coefficient of Yr and Wr -Vr as well as Vr -Wr graph. It is earnestly advised to inter-cross among the parents to evolve high heterotic lines and/or improved populations.

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