This research was carried out at the experiment station Obonuco, Pasto, from 1985 to 1987 with the purpose to determine heritability in broad sense, genetic gain, phenotypic correlations and genetic effects of the following characteristics: biological yield, economic yield, harvest index, number of effective tillers per plant, kernels per spike number, and 100O-seed weight among generations P1, P2, F11 F2,BC1, and BC2 of six crosses executed among five lines or varieties: ICA-Susata, L-23 Narino 85A, L-29 Narino 85A, ICA Yuriya and grano de Oro, The first three genotypes, females, have showed a high yielding potential while the last two varieties, males, had a low yielding potential under Narino eonditions.The 1000.seed wight was the charaeteristic which showed the highest heritability in broad sense with 51.37% . The cross 1 ICA Susata/Yuriya) gave the highest heritabilities for biological and economic yield, number of effective tillers and 1000 seed weight and the crosses 4 and 2 dor harvest index and kernels per spike number, respectively. Additive and dominant genetic effeets were the most predominant for 10O.seed weight, biological yield, number of effective tillers and kernels per spiks number. Additive and dominant genetic effects for economie yield were not significant in four of the six crosses while the additive genetic effects were the most important for harvest index. In general, the genetic gain was low for the number of effective tillers and the kernels per spike number. The biological yield along with eeonomic yield, 1000-seed weight and number of offective tillers of the cross 1 exhibited the greatest genetic gain. The harverst index was positive and significantlycorrelated with economie yield, number of effective tillers per plant, kernels per spike number and 1000-seed weight However, the association between the harverst index and the biological yield was not so clear and it was only observed in the cross 5. The othercharacters were correlated among them with exception of the association between the number of effective tillers and the 1000-seed weight which was only valid in the crosses 1 and 6.