Using the lod score test, 85 combinations of 19 biochemical and immunogenetic markers and 7 natural and radiation-induced chromosomal markers were checked with respect to linkage. Highly positive lod scores were obtained for the combination of the G blood-group locus with the rob (15;17) centric-fusion chromosome. Positive lod scores also were obtained for the G blood-group locus and the reciprocal translocation rcp (2p+;15q−) marker chromosome. Thus, it was concluded that the locus for the G blood-group system may be on chromosome 15 of swine. For several combinations of markers it was possible to exclude linkage at certain recombination frequencie
