Abstract
Fifteen visible mutants of the housefly have been isolated from Japanese populations and developed in marker strains suitable for further genetic investigation.
Although 6 linkage groups were to be expected from the known chromosome number, no sex-linked visible mutants were found, all the mutants being assignable to one or other of the 5 autosomal linkage groups.
In one strain the characteristic w+ of the second chromosome behaved as if it was sex-limited, it was suggested that the Y-chromosome was occasionally translocated to the second chromosome.
