Six cotton populations; P₁, P₂, F₁, F₂, BC₁ as well as BC₂ via two cotton crosses (Giza 92 x Giza 96) and (Giza 94 x Giza 96) were employed in the study, at Sakha Agricultural Research Station, Kafr El-Shiekh, Egypt. The results indicated that mean values for most studied traits in F₁ was better than parents, F₂, BC₁ and BC₂ populations. Heterosis values versus mid-parents and better parents were significant and positively for SCY/P, LCY/P, L% as well as LI with respect to the two studied crosses. High significantly inbreeding depression was showed in the case of cross I for SCY/P, LCY/P and BW, while, in the case of cross II was for PI. Phenotypic coefficient of variance (PCV) values were higher than the corresponding values of Genotypic coefficient of variance (GCV) for all studied characteristics in both two studied crosses. Dominance gene effects, demonstrated higher values than additive for all studied traits in both crosses, which indicates predominant role of dominance gene action in the inheritance of these traits. This finding indicated the hybrid production is a proper breeding program for improvement of these traits with respect to the parents involved in the present study. Highly broad sense heritability in two crosses was found for all traits, except for SI at cross II. Expected genetic advance (Δg%) with 10% selection intensity of individual plants ranged from 5.37% to 93.37% for L% and LI of cross I, respectively in the F₂ generation.