In Drosophila melanogaster, the black body (b*) is recessive to the gray body (b*), purple eyes (pr) are recessive to red eyes

Question

In Drosophila melanogaster, the black body (b*) is recessive to the gray body (b*), purple eyes (pr) are recessive to red eyes (pr*), and vestigial wings (vg) are recessive to normal wings (vg*). The loci encoding these traits are linked, with the map distances shown in the image.
The interference among these genes is 0.5. A fly with a black body, purple eyes, and vestigial wings is crossed with a fly homozygous for a gray body, red eyes, and normal wings. The female progeny are then crossed with males that have a black
body, purple eyes, and vestigial wings.
If a total of 1000 progeny are examined, determine the expected number of offspring that result from each crossover event.
double crossover:
single crossover between b and pr:
single crossover between vg and pr:

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