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Because the barring gene is carried on the Z chromosome, a male chick receives two "doses" ( BBcap B cap B

Several breeds have been developed—often by crossing a barred breed with a non-barred breed and then stabilizing the line—to achieve these results: autosexing

), which significantly lightens his down color. A female chick receives only one dose ( ), resulting in a darker, more defined pattern. Common Autosexing Breeds Because the barring gene is carried on the