Studies conducted in maize established that variance of dominance deviations of inbred lines were 1.6 to 3.3 times higher than the variance of dominance deviations for non-inbred maize individuals for key productivity traits (Edwards and Lamkey, 2002). Moreover, significant specific combining ability that is indicative of dominance variance has been reported for FRY and HI, while significant general combining ability has been reported for DMC (Cach et al., 2006).