Table 2 Suppression of the white mottled phenotype by different amounts of the X chromosome heterochromatin
Female Progeny
X Chromosome Heterochromatic Free Duplicationsywf/ywm; Dp(1)*y+ (E)ywf/ywm (C)
O.D.O.D.ΔO.D.a± SE%b
Dp(1) 11870.125060.074400.050660.00914.7
Dp(1) 12050.124130.064630.059500.01417.2
Dp(1) 13460.144890.067480.077410.01222.4
Dp(1) 11730.180190.070990.109200.00631.6
Dp(1) A1400.285080.064840.220240.0163.8
Y0.403200.057900.345300.007100.0
  • The results are of crosses of ywf/ywf females carrying the different X heterochromatic free duplications, or a Y chromosome, for males In(1)ywm/BsY.

  • Optical density (O.D. 480 nm) levels were measured in ywf/ywm/Dp(1)y+ (E) and ywf/ywm (C) female offspring.

  • The pigment assay was based on samples of 10 heads collected 3 d after eclosion of the flies. For each duplication, 10 samples were analyzed.

  • a ΔO.D. = O.D. (E) - O.D. (C).

  • b Percent of suppression = O.D. Dp(1)y+/O.D. of the Y chromosome.