LINKAGE MAPS OF PORCINE CHROMOSOME-3, CHROMOSOME-6, AND CHROMOSOME-9 BASED ON 31 POLYMORPHIC MARKERS

Linkage maps of porcine Chromosomes (Chrs) 3, 6, and 9, based on 31 po lymorphic markers, are reported. The markers include 14 microsatellite s, 12 RFLPs, three protein polymorphisms, and two blood group loci. Th e genetic interpretations of 11 RFLPs are documented. The markers were scored in a three-generation Wild Boar/Large White pedigree, and gene tic maps were constructed on the basis of two-point and multi-point li nkage analysis. Altogether the maps span a genetic distance of 216 cM, and previous physical assignments indicate that the linkage groups co ver major parts of the three chromosomes. Significant differences in r ecombination rates between the sexes were observed for all three chrom osomes. The recombination rate on the q arm of Chr 6 was markedly low. Sixteen loci are informative with regard to comparative mapping, that is, they have previously been mapped in the human and/or mouse genome s.