5.3kb insertion 69bp upstream of the y transcription start site. The insertion contains a central region of 2.9kb genomic DNA flanked by two copies of a 1.2kb deleted P-element, which are arranged in opposite orientations. The direction of transcription of the P-element that is most proximal to the y transcription start site is the same as that of the y gene, while the direction of transcription of the P-element that is most distal to the y transcription start site is opposite to that of the y gene. Neither the whole insertion nor the individual P-elements are flanked by the characteristic base pair duplications that are normally found after P-element insertion. The 2.9kb genomic fragment that is flanked by the P-elements includes sequences that originate from region 1A of the X chromosome in close proximity and distal to the y locus, and some repetitive sequences. It also contains a small putative gene (anon-1Ab) flanked by a TATA box and a polyadenylation site. The gypsy element present in the progenitor y2 allele is still present.
Body colour: wild-type pigmentation in the abdomen and bristles.
Body colour: homozygotes have wild-type pigmentation in the body cuticle and wing blade and in the thoracic, leg, wing and abdominal bristles.
Pigmentation of all cuticular structures is normal in hemizygous males. This phenotype is not altered by either mod(mdg4)ul or su(Hw)2.
y+s has abnormal body color | recessive phenotype, enhanceable by ph-pP1
ph-pP1, y+s has abnormal body color | recessive phenotype, suppressible by sneP1/sn[+]
ph-pP1, y+s has abnormal body color | recessive phenotype, suppressible by Su(y)P22P22/Su(y)P22[+]
ph-pP1, y+s has abnormal body color | recessive phenotype, suppressible by Su(y)P31[+]/Su(y)P31P31
ph-pP1, y+s has abnormal body color phenotype, suppressible by su(Hw)2
ph-pP1, y+s has abnormal body color phenotype, suppressible by su(Hw)V
Highly unstable allele.