Abstract
Genetic analysis of means and phenotypic variances for grain yield and several traits in five generation (P1,P2,F2,F3, and F4) for to crosses of a six row barley , Hordeum vulgare L.(Gezera-1 x Benedict and Baraka x Arivate) were carried out to estimate: gene action parameters, component of genetic variance, environmental variance ,average degree of dominance ,narrow sense heritability and expected genetic advance from selection in each of segregating generations (F2,F3 and F4). Tow models were applied in analyzing the component of generation means and weighted least squares method where used to analyze the phenotypic variance of generations rank. The results showed that :(1) the three parameter genetic models were adequate for the inheritance of 100 grain weight in the tow crosses and there were additive, dominance and epistemic effects on the other characters .(2) over dominance for plant height, number of spikes, grain yield and 100 grain weight but partial dominance for other traits in the two crosses .(3) narrow sense heritability and expected genetic advance from selection were higher in the F4 for studied traits.
