The Df(3R)abd-Aiab4,5-DB break lies at the 3' end of the iab-4 transcription unit.
DNA deletion from +83 to +113, extending into Abd-B sequences.
Deletion removes region between coordinates +85 and +113, removing 28kb.
85-113 kb deleted (Karch, Weiffenbach, Peifer, Bender, Duncan, Celniker, Crosby and Lewis, 1985)
Gonadal precursors do not coalesce into a gonad. Pole cells are released from the stalled gonadal precursors and are scattered throughout the embryo.
Segments A6 and A7 show a more posterior identity when heterozygous with Abd-B- than when hemizygous.
In homozygous adult males the fifth abdominal segment appears to be partially transformed towards A4.
Hemizygotes show A1 is slightly modified towards a more posterior segment, transformation is stronger in homozygotes. In males the A5 tergite is depigmented and resembles A4.
Homozygous males show a transformation of the fourth and fifth abdominal segments into the third.
D. Baker.
Induced with: iab-4DB.
Mutations in iab-4 have effects on the abd-A transcription unit, so such mutations are considered to be simultaneously mutant for iab-4 and abd-A.
Sterility is complemented by Abd-Biab5-301, Abd-BM1 and Abd-BStP20.