in the construction of genetic maps with optimal marker distribution. As expected, each co-dominant marker pair (each band was scored independently, Fig. 3) was located in the map at almost the same position, at distances between 2 to 10 cM. They failed to fall exactly at the same location because, being scored separately, their genetic distance theoretically matched the level of residual heterozygosity (1/25) which exists in this RI population after five rounds of selfing. The relative high frequency of co-dominant SRAP markers is another important advantage of this technique over AFLP markers.