using three cloned dna sequences from the centromere region and the proximal long arm of the x chromosome ( p8 , pdp34 , and s9 , which define respectively the chromosomal segments dxs1 , dxys1 , and dxs17 ) , we found no recombination between the dxs1 locus and the mutant genes in the three families .
C0008633
chromosomal
C1708726
locus