Abstract
A material of normal Danish families was tested for several genetic marker systems and analyzed for linkage. For the Colton-Kidd relationship the lod score was +2.57. The Kidd system was earlier tentatively assigned to chromosome 7. The present data therefore permit a tentative assignment to chromosome 7 of the Colton system as well. The discovery by Chapelle et al. (1975) of a conjunction of monosomy for chromosome 7 in the bone marrow of certain leukemia patients and absence of Colton antigen from the red cells may now be interpreted as being connected with location on chromosome 7 or the colton system.

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