The following data were collected from repeated matings of fruit flies (D. melanogaster). The data record the frequency, to 0.1 percent, of the recombinant characteristics for seven genes located on the same side of the centromere on chromosome 3. The veinlet gene is located one mapping unit from the centromere and acts a useful bench mark for comparison.

Construct a scaled chromosome map for chromosome 3 of D. melanogaster, using a scale of 1 mapping unit = 1 mm (or 2 mm). Show the locations of the eight genes including the veinlet gene.

	Scarlet eyes	Cardinal eyes	Javelin bristles	Stripe body	Minute bristles	Hairy body	Hairless bristles
Scarlet eyes			24.8	18.0
Cardinal eyes				12.7	31.5
Javelin bristles						7.3	50.3
Stripe body						35.5
Minute bristles							36.7
Veinlet veins		74.6				26.4
Hairy body							43.0