Mitochondria and the W chromosome: low variability on the W chromosome in birds is more likely to indicate selection on mitochondrial genes.
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D000818:Animals; D001717:Birds / Q000196:embryology / Q000235:genetics*; D002875:Chromosomes; D004625:Embryo, Nonmammalian; D014644:Genetic Variation; D008928:Mitochondria / Q000235:genetics*; D012641:Selection, Genetic