Figure 1.

A consensus genetic map derived from interspecies crosses between C. rhenaus and C. perifretum can be best anchored in the stickleback (Gasterosteus) genome, which permits the transfer of positional information to explore the Cottus genome. Filled blocks within linkage groups represent significantly collinear regions (P<0.05) with a perfectly conserved marker order. Grey blocks are collinear, but this was not found to be significant. Each of the parental species has a different and single heterogametic region that determines sex. These regions were identified on linkage groups 1 and 2 (see text) and are highlighted through bold marker names.