Abstract: A 5 x 5 diallel cross experiment involving five wheat varieties/lines viz., SARC-1, Tobari-66, 4072, 4943 and 4770 revealed that the traits like flag leaf area, spike length and spikelets per spike were controlled by over dominance type gene action, suggesting delayed selection to fairly good improvement in these traits. While number of grains per spike and grain yield per plant were governed by partial dominance type of gene action, determining fruitful selection in the early generation for these traits. Epistasis was absent in all the traits involved.