Deficiency breakpoint affecting the upstream Scr imaginal leg enhancer. The Scr transcription unit is not removed by the deficiency.
lethal (with Scr4)
visible (with Scr1)
visible | dominant
sex comb
sex comb (with Scr1)
sex comb (with Scr4)
Heterozygous males have a reduced number of sex comb teeth on the first leg. Scr4/ScrHu males are recovered at 2% of expected frequency and do not have sex comb teeth on the first legs.