In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a ...

In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eyes) and hairless (no thoracic bristles).
 
  Phenotypically wild-type F1 female progeny were mated to fully homozygous (mutant) males, and the following progeny (1000 total) were observed:
 
   Phenotypes Number Observed
   spineless 321
   wild-type 38
   claret, spineless 130
   claret 18
   claret, hairless 309
   hairless, claret, spineless 32
   hairless 140
   hairless, spineless 12
 
  (a) Which gene is in the middle?
  (b) With respect to the three genes mentioned in the problem, what are the genotypes of the homozygous parents used in making the phenotypically wild-type F1 heterozygote?
  (c) What are the map distances for the three genes? A correct formula with the values plugged in for each distance will be sufficient.
  (d) What is the coefficient of coincidence? A correct formula with the values plugged in will be sufficient.