Fig. 3
From: Breeding history and candidate genes responsible for black skin of Xichuan black-bone chicken
Gene flow analysis. a Maximum likelihood tree with 5 migration events. Migration events are shown as colored arrows, shaded according to their weight. Horizontal branch lengths are proportional to the amount of genetic drift that has occurred on each branch. The scale bar shows 10 times the average standard error of the entries in the sample covariance matrix. b Residual fit from the maximum likelihood tree in (a)