Descriptions of the genetic traits indicated by the gene symbols in Table 1 are given in the chapter on Qualitative Genetics in the Soybean Monograph (Bernard and Weiss, 1973). Recombination was calculated on F2 data us-ing the product method as described by Irrnner and Henderson (1943). All link-age combinations tested were found to follow independent assortment except the combination ln and p2.