Adults show a reduced response to sucrose in a feeding preference test. This phenotype is semidominant. Adults show an enhanced attraction to 100mM sodium chloride compared to wild-type, and tolerance to 0.5M NaCl and 0.2M potassium chloride. This phenotype is partially dominant. The threshold of avoidance of quinine is increased compared to wild-type. This phenotype is partially dominant. Homozygous adults show a normal electrophysiological response from the labellar chemoreceptors in response to 100mM NaCl or sucrose. Gtd¹/Dp(1;Y)y⁺v⁺#3 flies die as second instar larvae.

Enhanced attraction to NaCl in feeding-preference test, NaCl tolerance in ingestion test, relative indifference to sucrose and higher than normal threshold for quinine avoidance; all of these phenotypes semidominant. Gustatory responses of larvae normal. No alteration in electrophysiologically measured response of peripheral (labellar) neurons to NaCl; causes lethality of males hemizygous for the mutation who also carry duplication for normal allele. When heterozygous with gustC, which is closely linked, flies show reduced response to sucrose that is more severe than in tests of either homozygous or hemizygous type; three revertants of Gtd/y⁺Yv⁺#3 lethal interaction also reverted with respect to sucrose-indifference phenotype.