In drosophila, the mutant black (b) has a black body, and the wild type has a gr

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In drosophila, the mutant black (b) has a black body, and the wild type has a grey body; the mutant vestigial (vg) has wings that are much shorter and crumpled, compared with the long wings of the wild type. In the following cross, the true-breeding parents are listed together with the counts of offspring of F1 females x black and vestigial males: P-- black and normal x grey and vestigial F1--females x black and vestigial males Progeny: grey, normal: 283; grey, vestigial: 1,294; black, normal: 1,418; black, vestigial: 241. Use these data to calculate the map distance between the black and vestigial genes.

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