y1 individuals have a 'yellow' body color; the sex combs show reduced melanization and the sex comb teeth appeared thinner and smoother than in controls; the aedeagus show no melanization defects.
y1 males show severely reduced mating success when paired with wild-type females: copulation initiation is reduced, but there are no significant changes in courtship behavior (courtship time or wing extension bouts) or courtship song (pulse frequency, sine frequency or inter pulse interval), as compared to controls. This defect is not observed when y1 females are paired with wild-type males or when y1 males are paired with y1 females.
y1/y1#8 females have a completely null y[-] pigmentation phenotype in the wings and in the body.
The presence of Dp(1;2)y2A increases pigmentation in both the body and wing cuticle in y1/y1#8 females.
y1 males have significantly reduced mating success compared to control males. The Dp(1;f)1187 minichromosome rescues the mating success of these mutants. y1 adults lack pigmentation throughout the body, the wings, bristles, aristae and tarsal claws. The sex combs of y1 males have a lighter colour than wild type.
Body colour: pigmentation score (where 1 = null/nearly null, 5 = wild type/nearly wild type): homozygote: 1 (wing), 1 (body), hemizygote: 1 (wing), 1 (body), y1/yeve-tata : 2 (wing), 2-3 (body), y1/yhsp70-tata : 4-5 (wing), 4+-5 (body), y1/yw-DPE26 : 4 (wing), 4 (body), y1/yw-DPE29 : 2 (wing), 1+-2 (body), y1/yeve-tata-1 : 1 (wing), 1 (body), y1/yhsp70-tata-1 : 1 (wing), 1 (body), y1/yw-DPE26-1 : 1 (wing), 1 (body), y1/yw-DPE29-1 : 1 (wing), 1 (body), y1/yP1\loxP.eve-700gin : 2+-3 (wing), 2+ (body), y1/yP1\loxP.hsp70-700gin : 5 (wing), 4+-5 (body), y1/yP1\loxP.w-700gin : 2+-3 (wing), 2+ (body).
Males have a reduced wing extension index (the percentage of each courtship ritual during which a male's wing is extended and vibrating) compared to wild type.
A stripe of dark pigment seen in wild-type adult females near the posterior edge of abdominal segments A2-A6. I y1 mutants the black melanin is lost from the stripes leaving a brown pigment. The cuticle anterior to the stripe has a tan appearance relative to wild-type. In the thorax and wings, wild-type flies have a uniform colour. In y1 mutants these structures become tan.
The pigmentation induced in unpigmented y1 pharate adult tissue by incubation with dopamine in vitro closely resembles the y1 phenotype, producing brown pigmentation in all cuticle structures.
Body colour: no pigmentation.
Body colour: yellow; hairs & bristles brown with yellow tips; wing veins, wing hairs, yellow. Larval mouth part colour: yellow-brown. Larval denticle belt colour: yellow-brown.