Figure 1

Genetic divergence times can vary across different regions of a genome. Individuals within each generation are represented by open squares, connecting lines represent the transmission of alleles from one generation to the next. While full speciation occurs when members of the daughter populations no longer interbreed (black divergence time), individual regions of the genome in the two daughter species (for example, the green, blue and red regions) may share more ancient relationships, as indicated by the corresponding red, blue, and green divergence times on the right. Adapted from Hennig [11].