Linkage analyses of locus pairs involving A C P l , Co, J k , K and K m indicate: probable linkage between Go and J k ( 8 = + 3.80 a t 4 = 0.29) ; possible linkage between J k and Km ( 2 = + 1-93 a t 8 = 0-30); a mild hint of linkage between Co and K ( 2 = + 1-01 at 8 = 0 3 0 ) ; inadequate information for Co : Krn linkage; inconclusive resultg for loose linkage between ACPl and Co ; absence of detectable linkage for K : J k , K : Km, ACPl J k , ACPl : K and ACPl : K m . The compiled information does not allow assignment of Co, Jk or K to chromosome 2.