A novel locus on chromosome 1 underlies the evolution of a melanic plumage polymorphism in a wild songbird.

We also found a highly significant relationship between PC1 scores and the pheomelanin marker (Spearman's ρ = 0.834, p -value = 7.6 × 10 −6 ), consistent with the fact that most of the variation in reflectance spectra between morphs is related to variation in pheomelanin content. 3.2.

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