Breeding rabbits-- determine the relative positions of these three genes and the rfs between the first and second gene, and between the second and third gene.

h+ rightarrow one (dom), h rightarrow two heads (rec) e+ rightarrow long ears (dom), e rightarrow short ears (rec)
c+ rightarrow black (dom), c rightarrow white (rec)

cross e+ h c+ x e h c rightarrow 1000 offspring
e h+ c e h c
(gene order is drawn arbitrarily, and is unknown)
260 black, two-headed, long eared
280 white, one-headed, short eared
16 white, two-headed, long eared
14 black, one-headed, short eared
70 white, one-headed, long eared
80 black, two-headed, short eared
130 black, one-headed, long eared
150 white, two-headed, short eared