Asymmetry of GC → AT and AT → GC polymorphisms among loci in the “Dme_Glinka” data set. Each dot is for one locus. x-axis, locus GC content; y-axis, (nAT − nGC)/nXY, where nAT is the number of AT ↔ GC polymorphic sites showing a frequency of the A or the T <50%, nGC the number of AT ↔ GC polymorphic sites showing a frequency of the A or the T >50%, and nXY is the total number of polymorphic sites for the considered locus.