Frequencies of house fly proto-Y chromosomes across populations are predicted by temperature heterogeneity within populations. - Foy PD; Loetzerich SR; Boxler D; Burgess ER 4th; Trout Fryxell RT; Gerry AC; Hinkle NC; Machtinger ET; Olds C; Tarone AM; Watson W; Scott JG; et al. (The Journal of heredity, 2025)