Five wheat genotypes viz., 8073, 8177, 6039-4, Pb-96 and MH-97 were crossed in a diallel fashion to ascertain the genetic control of some polygenic traits. The analysis of variance revealed that the differences among genotypes for all the traits studied, were highly significant. The parameters like number of tillers per plant, plant height, number of grains per spike, 1000-grain weight and grain yield per plant were controlled by over-dominance type of gene action. Spike length was governed by partial dominance with additive gene action. Number of spikelets per spike was under control of partial dominance. Epistasis was present in plant height, spike length and 1000-grain weight.