Fig. 3
From: A survey of methods and tools to detect recent and strong positive selection
Bottleneck demographic scenarios (top panel) may result in similar genealogies to a selective sweep (bottom panel). Both models may produce very short coalescent trees. As we move from the selection site, selective sweeps produce genealogies with long internal branches. Similarly, bottlenecks may produce genealogies with very long internal branches if the ancestral population size is large