You find two mutations that cause blue wings (b blue is recessive to b+ normal)

Question

You find two mutations that cause blue wings (b blue is recessive to b+ normal) and spiny bristles (W wiry is dominant to W+ normal). They are linked to this chromosome (pictured). Based on test cross data, complete the map to include these genes.

Br b+ W/Br+ b W+ x Br+ b W+/Br+ b W+

387 Br b+ W
384 Br+ b W+
70 Br b+ W+
67 Br+ b W
40 Br b W
43 Br+ b+ W+
5 Br b W+
4 Br+ b+ W

Can someone just please help me figure out how to determine gene order? I'm trying to compare parentals and double crossovers but I cannot for the life of me figure it out.

Explanation / Answer

A-B=40%
A-C=13% B-C=27%
A-D=31% B-D=9% C-D=18%

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