Fig. 1

Growth heterosis in a yeast hybrid. a Growth heterosis in the yeast hybrid in rich and stress media. Cells were diluted into rich (SD, YPD) or stress media (YPD + 7.5% ethanol, YPD in 37 °C, 0.2 mM Pi), and doubling time was measured by following their optical density (OD). Cultures were diluted periodically to maintain the cells in logarithmic phase for the duration of the experiment. Different repeats indicate biological replicas. b Growth pattern of the hybrid and its diploid parents presented with rich (SD) media. c Perturbed cell-cycle delays in hybrid. Shown are the median cell-cycle times of the unbudded (G1) and budded (S + G2 + M) hybrid and its diploid parents. Mother and daughters are shown separately. Data extracted from live-cell microscopy (see Additional files 2, 3 and 4: Movies S1–S3, and time distributions in Additional file 1: Figure S1B)