Heterozygous males have a darker A4 abdominal segment than normal, representing a partial transformation of A4 towards A5.
hthk1 has visible | dominant | male phenotype, enhanceable by Df(2R)cn88b/+
hthk1 has visible | dominant | male phenotype, enhanceable by jingk03404
hthk1 has adult abdominal segment 4 | male phenotype, enhanceable by Df(2R)cn88b/+
hthk1 has adult abdominal segment 4 | male phenotype, enhanceable by jing[+]/jing22F3
hthk1 has adult abdominal segment 4 | male phenotype, enhanceable by jing[+]/jing01094
hthk1 has adult abdominal segment 4 | male phenotype, enhanceable by jingk03404