To study the inheritance and nature of action of the genes controlling traits related to maize grain yield, generations mean analysis was performed on two crosses using inbred lines K18 and K3218 as first cross parents, Mo17 and K74/1 as second cross parents and their F1, F2, BC1 and BC2 pregrins. The experiment was conducted using a randomized complete block design with three replications in 2001. Analysis of variance and mean comparison indicated a significant difference between parental as well as between progeny generations. The results of generations mean analysis revealed that dominance effects had an important and significant role in most traits including seed yield per plant in each of the crosses. Epistatic effects were detected in seed yield per plant as well as in yield components each of the crosses. Broad sense and narrow sense heritability were low for seed yield and most of its related traits indicating polygenic nature of these traits.
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