Variation in Recombination Frequencies in Schizophyllum commune and its Genetic Control

Abstract

Several chromosomal segments on the linkage group of the A incompatability factor in S. commune were studied. Recombination frequencies at the dm-9-AIX and AIX-ad-5 regions are controlled by different genetic systems. No evidence of genetic control of recombination is found in the ad-5-Ap region. Extensive study of the recombination frequencies in the region pab-ad-5 revealed that a major genetic factor, rec-I, is involved. The dominant allele of the rec-I gene tends to reduce recom-bination frequencies. The gene is linked to the ad-5 locus at about 20 map units.