WO genes which affect xanthine dehydrogenase in Drosophila melanogaster Tare already known. These are maroon-like (ma-1) on the X chromosome, and rosy ( r y ) on the third chromosome. The phenotype of both of these mutants is a dark red-brown eye color. When either of these genes is homozygous, the mutant flies have no detectable amounts of xanthine dehydrogenase (FORREST, GLASSMAN, and MITCHEL...
