In order to estimate the gene action for yield and its related traits in French bean, five basic generations (P1, P2, F1, F2 and F3) were evaluated in a cross Gokak Local x Ring Beans in randomized complete block design in a field experiment. Observations viz., plant height, number of branches, number of leaves, pod length, pod width, number of pods per plant, green pod weight, number of seeds per pod and seed yield per plant were recorded. Generation mean analysis using A, B, C and joint scaling tests indicated that additive (d), dominance (h) and at least one of the epistatic effect [additive x additive (i) and dominance x dominance (l)] were involved in the inheritance of the studied traits. Significant dominance (h) and dominance x dominance (l) interactions with opposite sign indicated duplicate epistasis for all traits. Average dominance ratio was more than unity for pod length, pod width, number of pods per plant and green pod weight, which showed the high importance of dominance gene effect in control of these traits. The presence of greater dominance gene effects was found for most of the characters except for number of seeds per pod. Among two segregating populations (F2 and F3), most of the characters had superior segregants in F2 population than in F3. Selections like, diallel selective mating or biparental mating in early segregating population and selection followed by hybridization might prove to be alternative approaches to improve the traits.