Polytene chromosomes normal.
50kb inversion from map position +85 to +135.
Heterozygous males have an average of 6.7 ectopic sex comb teeth per second leg. Heterozygous males have an average of 1.8 ectopic sex comb teeth per third leg. ScrW/Scr4 males (mutations in trans) have an average of 0.1 ectopic sex comb teeth per second leg and no ectopic sex comb teeth on the third legs. ScrW Scr4/+ males (mutations in cis) have an average of 3.2 ectopic sex comb teeth per second leg and an average of 1.0 ectopic sex comb teeth per third leg. ScrW/Scr4 ; Dp(3;Y)77ab males have an average of 0.1 ectopic sex comb teeth per second leg and no ectopic sex comb teeth on the third legs.
Dominant allele.
Extra sex combs present an all six legs of males.
Partial transformation of second and third legs into first legs.
Abd-BFab7-12 (which deletes the Fab-7 element) induces a significant increase in the number of sex comb teeth in the T1 leg in ScrW Scr4/+ males (mutations in cis).
Wakimoto.