Evaluates "patterns of introgression across the hybrid zone for 13 diagnostic X-linked loci with known chromosomal positions using a maximum likelihood model". Finds different patterns. Correlates cline width and cline center at different loci.
R. Wang, J. Wakeley, and J. Hey. Genetics, 147 (3):
1091-1106(1997)In three species of Drosophila, looks at three different nuclear loci (two of which is on the X chromosome) and finds evidence of recent gene flow in one, but not in the other two. Cites mtDNA and allozyme studies as well, with differing conclusions..
M. Macholan, P. Munclinger, M. Sugerkova, P. Dufkova, B. Bimova, E. Bozikova, J. Zima, and J. Pialek. Evolution, 61 (4):
746-771(2007)The "first comprehensive study of the introgression of both autosomal and sex-chromosome markers across the central European portion of the hybrid zone between two house mouse subspecies, Mus musculus musculus and M. m. domesticus."
Gets different results for autosomal and X-linked loci. Used four microsats, seven (enzymatic) autosomal loci, and five X-linked loci. Has data from about 1500 mice. Lots of fancy 2-D cline fitting. Estimates strength of selection from fitted cline shapes. Has "sobering" conclusions about the difficulty of such an analysis..