Figure 1. Genetic map of linkage group E of the USDA-ISU soybean map, consisting of a gene for pubescence (Pb), an SSR (Satt45), and RFLP markers. Distances between loci are given in centiMorgans.

Figure 2. Genetic and physical maps of a soybean chromosomal region encompassing disease resistance genes. Individual BACs in the contig are identified by their address in the BAC library. Dashed lines connect the appropriate BAC end to its marker position on genetic map ‘J’. Rmd, resistance to powdery mildew; Rps2, resistance to Phytophthora sojae; Rj2, ineffective nodulation; A724, A233, RFLP markers that anchor Rmd, Rj2 and Rps2 to linkage group J in the USDA-ISU Glycine max × G. soja genetic map; E33T22, AFLP marker; 91F11, 89L6R2, 25B1U, 68J10R, PCR markers from BAC end sequences; 91F11B9MU, PCR marker from BAC 91F11 B9 M subclone; Sat_144, microsatellite marker developed from BAC 10C2. Figure kindly provided by Michelle A Graham, Department of Agronomy, Iowa State University.

Figure 3. Aligned maps showing chromosomal locations of conserved DNA sequences in two species (A and B). Lines connect analogous DNA markers (m) between species. Changes in the positions of the m markers in species B could be due to chromosomal rearrangements during divergent evolutionary processes. There is a strong possibility that a gene from a conserved block of DNA (e.g. gene 1 of species A, located between m4 and m5) is present in the syntenic region in species B.