Homozygote nearly lethal but has no h phenotype. Heterozygote with h1 and h2 also wild type. h13/+ has extra hairs on wings, head, pleurae, halteres, and occasionally on scutellum if also heterozygous for certain X-chromosome inversions that variegate for the 'Hw' phenotype, including In(1)sc8, In(1)scS1, and In(1)y3P. Presence of Dp(1;Y)y+ also induces extra hairs. RK3.
In(1)sc8, hry13 has microchaeta phenotype
In(1)scS1, hry13 has microchaeta phenotype
In(1)y3P, hry13 has microchaeta phenotype
Dp(1;Y)y+, hry13 has microchaeta phenotype
Green.