The following X-linked recessive traits are found in fruit flies:

vermilion eyes are recessive to red eyes, miniature wings are recessive to long wings, and sable body is recessive to gray body. A cross was made between wild-type males with red eyes, long wings, and gray bodies and females with vermilion eyes, miniature wings, and sable bodies. The heterozygous female offspring from this cross, which had red eyes, long wings, and gray bodies, were then crossed to males with vermilion eyes, miniature wings, and sable bodies. The following data were obtained for the F2 generation (including both males and females):1320 vermilion eyes, miniature wings, sable body 1346 red eyes, long wings, gray body 102 vermilion eyes, miniature wings, gray body 90 red eyes, long wings, sable body 42 vermilion eyes, long wings, gray body 48 red eyes, miniature wings, sable body 2 vermilion eyes, long wings, sable body 1 red eyes, miniature wings, gray body 

A. Calculate the map distances separating the three genes.

B. Is positive interference occurring?