TABLE 1

Enhancer effect of ptnD on position-effect variegation

GenotypeaPosition-effect variegationc
RearrangementSex chromosomesAutosomesNo. of fliesViability (%)bWhite variegation in % of eyes (red eye pigments)Roughest variegation (% of eyes)Vertical variegation (% of flies)Notch variegation (% of flies)
In(1)wm4hwm4h/wm4h+/TM3155100000
ptnD/+135all w-98.86.11.2
wm4h/Y+/TM3123100000
ptnD/+4637.4all w-10026.1
In(1)rst3rst3/w+/TM33040
ptnD/+3061000.3
rst3/Y+/TM3314w+1001.0
ptnD/+27487.3w+10058.0
In(1)wm51bwm51b/w+/TM3228100 (43.1)0
ptnD/+207100 (5.1)0
wm51b/Y+/TM3213100 (93.3)00
ptnD/+19792.5100 (15.9)79.716.2
T(1;2)N264-10N264-10/w+/TM383w+2.4
ptnD/+8410030.9
T(1;2)wm258-21wm258-21/w+/TM3119100 (104.1)85.9
ptnD/+149100 (31.3)100
T(1;2)Na8Na8/w+/TM3135100 (7.7)Notch-
ptnD/+139100 (3.6)Notch-
Variegation for scuted
In(1)sc8sc8/Y (25°)+/TM31852.88
ptnD/+13371.90.71
sc8/Y (18°)+/TM31863.89
ptnD/+3317.11.20
In(1)scS1scS1/Y (25°)+/TM3106
ptnD/+5854.7
scS1/Y (18°)+/TM392
ptnD/+1516.3
  • a Homozygous wm4h females were crossed to wm4h/Y; ptnD/TM3, Sb males. Otherwise the homozygous (rst3, wm51b, sc8) or heterozygous (N264-10, wm258-21, N8a, scS1) females were crossed to w/Y; ptnD/TM3, Sb males. PEV in +/TM3, Sb control and ptnD/+ sibling genotypes was compared.

  • b Percentage of control. Unless otherwise indicated, the fly cultures developed at 25°.

  • c —, phenotypically not detectable inactivation of the gene (due to recessive phenotype or lethality). Red eye pigments in percentage of wild-type Canton-S flies are shown.

  • d Mean number of scutellar bristles.