FIG. 1.

(A) XhoI digestion of DNA purified from dikaryotic strain N001 and some monokaryons of the mapping population. Two polymorphic bands (3.7 and 3.9 kbp) of repetitive DNA segregating as alleles can be observed (rXhoI marker). (B) RFLP pattern obtained using a portion of the rDNA of S. carlsbergensis as a probe for Southern hybridization of the digested DNA shown in panel A. Two polymorphic bands segregating as alleles can be observed (Rib marker). These bands are coincident with the two bands of repetitive DNA in panel A.