Retains six IGS repeats.
4.1kb segment of bb consisting of a complete intergenic spacer (IGS) region, an rDNA promoter and 140bp of external transcribed sequences.
Construct: Deletion of 18S gene and most of the external transcribed spacer (ETS).
Improves male fertility and recovery of reciprocal products from Df(1)X-1/Dp(1;Y)BSYy+ males.
Increases the frequency of X-Y nondisjunction seen in Df(1)X-1/Dp(1;Y)BSYy+ males.
Heterozygotes with Dp(1;Y)BSYy+ display significant stimulation of X-Y disjunction in adult testes when recombined with Df(1)X-1, in genetic and cytological assays.