Table 5 Suppression of the white mottled phenotype by different amounts of the second chromosome heterochromatin
Female Progeny
Second Chromosome Heterochromatic Free Duplicationsywf/ywm; Dp(2)*y+ (E)ywf/ywm (C)
O.D.O.D.ΔO.D.a± SE%b
Dp(2) e510.073990.023950.050040.00614.5
Dp(2) e580.159050.028050.131000.0137.9
Dp(2) e970.176790.024410.152380.0344.1
Y0.403200.057950.345250.007100.0
  • The results are of crosses of ywf/ywf females carrying the different second chromosome heterochromatic free duplications, or y+Y chromosome, for males In(1)ywm/BsY. Optical density (O.D. 480 nm) levels were measured in ywf/ywm/Dp(2)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(2)y+/O.D. of the Y chromosome.