F2 linkage results are presented in Table 1 with a= XY, b = Xy, c = xY, and d = xy for the gene pairs listed in the form of Xx and Yy. Percentage recombination was obtained as previously (Buzzell, 1974). As reported previously (Buzzell, 1975), the T31 that I am using appeared to carry 1n in contrast to the Ln T31 used by Weiss (1970).