Cg was originally mapped 5 m.u. proximal to d1 on the basis of 3 point test cross data involving lg2 and d1 (Galinat, MNL 26). This position is now in doubt because two-point test crosses between Cg and cl, g2 and cr fail to reveal any linkage with these markers.
Information about the linkage between Cg and d1 is still unavailable, but since cl and cr are approximately 20 m.u. on either side of d1, it would be surprising if Cg was linked to this marker. The possibility that Cg is located on 3L is now being tested.
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