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This investigation was carried out at Bahteem Agric. Res. Station through the three growing seasons of 2005/2006, 2006/2007 and 2007/2008 aiming to study gene effects for yield and its components in four bread wheat crosses namely; 1(Gemmeiza 9 X Giza 168); 2(Sids 1 X Giza168); 3(Sids 1 X Sakha 8) and 4(Sakha 8 X Gemmeiza 9). The results showed that additive gene effects (d) was important in the inheritance of spike grain weight, number of grains/spike and kernel weight in the 1 cross. Meanwhile, dominance genetic variance was the main components controlling the inheritance of plant height, spike grain weight, number of grains/spike and kernel weight mainly in other crosses. The results of the two digenic epistatic effects additive X additive (i) and dominance X dominance (L) confirm its importance role in the genetic system controlling most of the studied characters. Over-dominance cases were involved in the inheritance of plant height, spike grain weight, number of grains/spike and 100kernel weight in the 1 cross, while partial dominance was present for both number of spikes/plant and total weight/plant in the same cross. The 4 cross gave the highest heterotic value over its better parent for grain yield/plant followed by the 3 cross and at the same time gave highly heterotic values for at least one of its yield components for number of grains/spike. The highest estimates of narrow sense heritability were detected for plant height, grain yield/plant, kernel weight and number of grains/spike in the 1 cross. Moderate heritability estimates were also detected for total weight/plant in the 1 and 2 crosses. High expected genetic gain were found to be associated with high narrow sense heritability estimates which makes selection for such traits in the early generations possible

ESTIMATES OF GENETIC EFFECTS FOR YIELD AND ITS ATRRIBUTES IN CERTAIN BREAD WHEAT CROSSES.