Heterozygotes exhibit thickened wing veins. Heterozygotes with Ser^Bd-3 are lethal (due in part to a second site lethal on the Ser chromosome), a 'cleaned up' e Ser^Bd-3 chromosome when heterozygous with Df(3R)Delta-BX6 has reduced viability and survivors exhibit rough eyes, duplicated bristles and greatly reduced wing blades. Further replacement of proximal chromosomal regions (recombining P{lacZ.w⁺}Y488 insertion onto Ser chromosome) allows full viability when heterozygous with Df(3R)Delta-BX6, but still with severe wing phenotypes. Heterozygotes with Ser^Bd-3rev2A or Ser^Bd-3rev7A exhibit loss of anterior wing margin and thickening of wing veins. Heterozygotes with Ser^Bd-3 are lethal.

Severe "abruptex" phenotype. Capable of rescuing the lethality conferred by all negatively complementing Ax heteroallelic combinations, individuals display an Ax, not wild type, phenotype. Suppresses phenotypes of all viable "abruptex" alleles but not the lethality of the lethal "abruptex" alleles.