Six populations of three wheat crosses were grown during three consecutive seasons, at Fac. of Agric., Zagazig Univ., Egypt to estimate the adequacy of genetic model of gene action for the evaluated characters. Scaling tests data indicated that non-allelic interaction controlled most of the studies traits in all crosses, except days to heading in t 3^rd one. The genetic model recorded that all genetic types were significant for plant height in the 3^rd cross. Dominance (h) gene effect was negative and significant for days to heading and plant height in 2^nd cross, whereas it was positive and significant for spikes/plant in 2^nd cross and grains/spike, weight of 1000 grain and grain yield/plant in all crosses. Heritability was high (>50%) for days to heading in 1^st and 2^nd crosses, plant height in 1^st cross and spikes/plant number, weight of 1000 grain and grain yield /plant in the 2^nd one. Dominance ratio was less than unity in 1^st and 2^nd crosses for days to heading, 3^rd cross for spikes/plant and the 2^nd cross for weight of 1000 grain. Days to heading recorded a moderate genetic advance in the 1^st and 2^nd crosses, whereas a low values of this parameter were recorded in the 2^nd and 3^rd crosses for plant height and in all crosses for spikes/plant, grains/spike, weight of 1000 grain and grain yield/plant.