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The phenomenon of heterosis provides a great opportunity for plant breeders to gain greater performance and yield in the hybrids compared to their inbred line parents. In most cross-pollinated crops like maize, heterosis plays an important role as the performance of the hybrids is of a great value. Heterosis gain much interest until recently and current studies still attempt to elucidateone of these is utilizing molecular markers to estimate genetic distances among inbred lines followed by developing putative groups. In a wellde ned heterotic group, between-groups mating are expected to produce better hybrids than within-groups mating. Some studies of marker-aided heterotic group development resulted in functional heterotic groups; while some other reported that the groups failed to provide evidence of heterosis in the hybrids. Considering the prediction of hybrids' performance will depend on genetic background of inbred lines, and markers technology are continuously improved, there is still a good opportunity to obtain useful heterotic groups for a particular breeding population. Keywords: maize breeding, genetic distance, heterosis, molecular markers.

The Usefulness of Molecular Markers Approach for Developing Heterotic Groups in Maize