Fig. 4
From: Breeding history and candidate genes responsible for black skin of Xichuan black-bone chicken
Population genetics and demographic history. a Time of divergence between populations. The number at each node represents the time of divergence in thousands of years. b Demographic history of XBC and 4 other Chinese chicken breeds. Generation time (g) = 1 year and trans-version mutation rate (μ) = 1.91 × 10− 9 mutations per base pair per generation