Fig. 7

Schematic of predicted synteny patterns in the case of shared ancestral fusion. Two ancestral chromosomes (orange and green rectangles, with genes depicted as numbers) undergo WGD. Paralogous chromosome pairs diverge as a part of the diploidization process. A fusion joins one version of the “orange” chromosome (“1, 3, 5”) with one version of the “green” chromosome (“7, 10, 8.”) If this took place in the common tetraploid ancestor of eudicots, the fused chromosomes in columbine and grape should also carry these versions on their “orange” and “green” portions. In the hypothetical example here, diploidization precedes the fusion event but may well happen afterwards with no effect on the predicted synteny patterns