SUMMARY: The genes conferring white fruiting bodies (), growth-temperature sensitivity in strain x9 () and resistance to methanol or acriflavine () are linked in a group designated chromosome II. A gene, present in strain 2 and involved in the ability of this strain to grow axenically (), has also been located on chromosome II. An analysis of diploid strains derived from a diploid initially heterozygous for all known genes of chromosome II has revealed that mitotic crossing-over occurs during the vegetative growth of diploid cells. An analysis of the classes of diploid thus isolated leads to a provisional ordering of the genes on chromosome II: centromere, . The final element necessary to establish the existence of a parasexual cycle in has thus been demonstrated.


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