The combination of the SerBd-3 and Ser+r83k alleles in trans results in the development of a vestigial wing.
Heterozygotes with SerBd-3 die as pharate adults with abnormalities in the leg such as fusion of the femur and tibial segments and loss of the wing blade. Homozygotes and hemizygotes are viable.
Loss of the dominant wing nicking phenotype. SerBd-3 Ser+r83k combination is lethal, flies die as pupae and when dissected from the pupal case they exhibit eye roughening, lack of wing blade and haltere material and fusion of the first and second tarsal segment of all six legs.