Binary-evolution calculation of the MS_110 progenitor model. In panel a), the solid, dashed, and dash-dotted curves show the mass-transfer rate, Ṁ₂, the mass-growth rate of the CO WD, Ṁ_CO, and the mass of the CO WD, M_WD. In panel b), the evolutionary track of the donor star is shown as a solid curve and the evolution of the orbital period is shown as a dashed-dotted curve. The dotted vertical lines in both panels and asterisks in panel b) indicate the position where the WD explodes as an SN Ia.