301894.fig.001
Figure 1: A hybrid sterility and inviability model based on chromatin evolution and molecular drive in speciation. Repetitive satellite DNAs evolve rapidly, thereby accelerating the evolution of chromatin-binding proteins (from the common ancestor to species 1 and species 2). Hybrids are sterile or inviable because the chromatin-binding proteins from species 2 cannot recognize the repetitive sequences of species 1.