Fig. 2
From: Managing genomic diversity in conservation programs of Chinese domestic chickens
Population genetic structure. a Neighbor-joining tree constructed using SNP data from ex situ and in situ conserved populations of the three chicken breeds. b PCA analysis of subpopulations. The first three principal components are shown, and the subpopulations are color-coded according to the key to the right. c Inferred population genetic structure using the maximum-likelihood method under a model with ancestral components varying from K = 2 to 6