A vial of testcross fruit flies from a cross between females heterozygous for 3 chromosome 2 mutants (+++/b vg bw) and males homozygous for the mutants (b vg bw/b vg bw). The positions of the mutants on chromosome 2 are: black (b), 48.5; vestigial (vg), 67.0; and brown (bw), 104.5.
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