The P1, P2, F1, F2, B1 and B2 twelve pea crosses were studied for nine metric traits. The results of the studies suggested the presence of additive, dominance gene effects and epistatic interaction in almost all cases indicating the importance of both additive and non-additive gene action in the expression of these characters in the study. Duplicate type of epistasis was prevalent in most of the cases. A substantial amount of heterosis over better parent (HBP) was revealed by the crosses HUP2 x KPSDl, FCl x T163 and FCl x Pusa 10 for seed yield per plant, pods per plant, biological yield per plant and harvest-index. Suitable breeding strategies were suggested for the improvement of yield in pea.