ABOUT THIS IMAGE. This image shows two random genealogical trees
simulated under the coalescent, conditional on having specific numbers
of ancestors at a fixed point in time.
The fixed time point is represented by the white horizontal line.
A genealogy forced to have a small number of ancestors far back in the
past (left) appears similar to typical genealogies simulated
unconditionally under the coalescent. However, a genealogy forced to
have many ancestors contains several long external branches (right).
The figure is based on the work of Blum & Rosenberg (Estimating the number of
ancestral lineages using a maximum-likelihood method based on
rejection sampling; Genetics 176: 1741-1757, 2006).
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