A Study of Dominant Mosaic Eye-Color Mutants in Drosophila melanogaster. I. Phenotypes and Loci Involved

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Abstract
Six dominant mosaic eye-color mutants were found to be allelomorphic to the 2nd-chromosome recessive gene brown. This locus is especially liable to lethal dominant mosaic changes following x-ray treatment. In every case the 2nd chromosome was broken at or near the locus of brown; 4 of the 6 cases were mutual translocations, 2 were inversions. A similar dominant lethal mosaic allelomorph of the recessive gene pink (3rd chromosome), and 2 allelomorphic mosaic genes in the left arm of the 3rd chromosome were also associated with inversion or mutual translocation. Rare homo-zygotes of the brown allelomorphs have a pale almost non-mosaic eye-color and wing abnormalities. The pheno-typic colors and types of mosaicism are also described.

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