The bread wheat is one of the most important crop providing one-fifth of total calories for world’s population. Growth in population is increasing the demand for wheat. Wheat breeders have been concentrated on development of HYV’s (High yielding varieties) which required genetic information (mode of inheritance and gene action parameters of yield components) of parental population. For this purpose diallel analysis used. This experiment was carried out with seven wheat genotypes (Triticum aestivumL.) viz- HD3159, WAXWING/ /INQALAB91*2/KUKUNA/3/WBLL1*2/ TUKURU/ 8, TACUPETO F2001/ BRAMBLING/ 5/NAC/ TH.AC/ /3*PVN /3/ MIRLO, CROC-1 /AE.SQUARROSA, PASTOR/ / HXL7573/2*BAU /3/ WBLL1/ 6/ MTRWA92.161/ PRINIA/5, WH1080 and PBW660, were used as parents for 7 × 7 half-diallel analysis to estimate General Combining Ability (GCA) and Specific Combining Ability (SCA) variances and effects. Genetic analysis indicated that additive variation and non-additive components of genetic variation included dominance and epistatis type gene action and involved in inheritance of all the characters under study. Magnitude of fixable(GCA) components was considerably higher than non fixable component additive variance for all the characters except number of grains per spike representing the predominance of additive gene action. The parents CROC-1/AE.SQUARROSA and TACUPETO F2001/BRAMBLING/5/NAC/TH.AC//3*PVN/3/MIRLO found to be good general combiners for grain yield per plant and most of its component characters and were one of the parents in most of the best specific cross combinations. The WAXWING/ /INQALAB91* 2/KUKUNA /3 / WBLL1 *2/ TUKURU/8 × PASTOR/ /HXL7573 /2*BAU /3 /WBLL1/6/ MTRWA92.161/ PRINIA/5(12.293) and TACUPETO F2001 /BRAMBLING/5 /NAC /TH.AC / /3*PVN/3/ MIRLO × PBW660 (10.249) were the best cross combinations for yield and most of its components. In view of parallel role of both additive and non-additive genetic effects determining the inheritance of different characters, utilization of these variabilty by using biparental mating scheme is suggested.

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