Mutant phenotype is cytotype independent. Heterozygotes with vg21
show moderate wing nicking. Homozygotes always show wing abnormalities in both wings, ranging from a double nick on the distal wing margin to a moderate "strap wing" in which substantial parts of both the anterior and posterior margins are missing. Homozygotes: moderate wing phenotype. Heterozygotes with Df(2R)vg-B
in M cytotype: extreme wing phenotype. Heterozygotes with Df(2R)vg-B
in cytotype: extreme wing phenotype.