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Extended black extends the black on the bird.

Extended black is a gene on the e locus. Other genes on the e locus are duckwing (wildtype), wheaten, partridge, and birchen. Black is just a color. Black is a phenotype.

Extended black is the gene that makes a chicken solid black. He has this in addition to blue. Extended black needs a melanizer gene to produce a solid black chicken, otherwise it will have leakage. (Colors that aren’t black.) The reason for his leakage (the colors that aren’t black) is that he...

Correct

Mahogany and autosomal red are not responsible for his wing bow coloring but they are responsible for enabling red wing bows on a cock that would otherwise be silver, if you are interested in learning more about genetics.

The gene that produces that wing bow coloring is the sexlinked silver/gold gene. He has one copy of silver and one copy of gold so he is S/s+ or "golden" He can pass it on to his sons. If he is bred to a silver (S/-) hen he will produce silver (S/S) and golden (S/s+) sons and silver (S/-) and...