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Figure 1 | BMC Evolutionary Biology

Figure 1

From: Using supernetworks to distinguish hybridization from lineage-sorting

Figure 1

An example of two applications of the Z-rule, which underpins the Z-closure supernetwork method, where two partial splits displayed in the input trees (A) are extended to complete splits as shown in (B) and (C). The bold lines that form the 'Z' shape indicate that the intersection of the taxon sets is non-empty, eg in (B) {C,D}∩ {D,M} = {D}, {D,M}∩ {M,P,T} = {M}, {M,P,T}∩ {O,P,T} = {P,T}, but {C,D}∩ {O,P,T} = ∅ so the Z-rule can be applied.

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