Dp(1;f)γ878/Dp(1;f)19C heterozygotes increases y+ expression, to 50% of full Dp(1;f)γ158 trans-suppression. y+ expression is quantitated in triple row bristles.
Contains 140kb of centric heterochromatin in inverted orientation.
Monosome transmission behaviour from both male and female parents is highly unstable, heterochromatin contains only part of Bora Bora.
"Terminal" deletion.