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To investigate the dominance and recessiveness of the homothallism genes, HMα/hmα and HMa/hma, for mating-type conversion, we constructed hybrids with various configurations of the homothallic genes by fusion of protoplasts prepared from haploid strains having identical mating types. Eight different combinations of the homothallic genes were tested for their function by observing the mating and sporulation abilities of the fusion products. With few exceptions, nonmating and sporogenous fusion products were obtained from the following combinations: α HO hmα  HMa + α ho hmα hma, α HO hmα HMa + α ho HMα hma, α HO hmα HMa + α ho HMα HMa, α HO HMα hma + a ho hmα hma, a HO HMα hma + a ho hmα HMa and a HO HMα hma + α ho HMα HMa. All the fusion products from the α HO hmα HMa + α ho hmα HMa and a HO HMα hma + a ho HMα hma combinations showed mating types identical to those of the respective haploid strains. These results clearly support the co-dominance of the HMα/hmα and HMa/hma alleles and indicate that the hmα allele has the same function as the HMa allele and that the hma allele has the same function as the HMα allele.

EVIDENCE FOR CO-DOMINANCE OF THE HOMOTHALLIC GENES, HMα/hmα AND HM a/hm a, IN SACCHAROMYCES YEASTS