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Numbers of male versus female markers in the linkage maps of the ZW species Hyla sarda and H. savignyi (left). Unlike in the XY species H. arborea (right, adapted from Brelsford et al. 2016a), all twelve linkage groups, including the sex-linkage group (LG4A7A), show comparable numbers of male- and female-informative markers. Dashed lines show diagonals.
