Then, I went a reread what F.B. Hutt wrote on the topic in his classic “Genetics of the Fowl” Pg 489: “MacArthur (1933) added similar data for a dominant gene Br, which causes a light iris, ranging in color from yellow-orange to bay, in contrast to the brownish-blackish iris.” This quote came from a small subchapter titled “the chromosome map”. It listed the following genes to be linked to this recessive sex-linked light eyed gene Br: K (slow feathering); S (silver); Li (light down); Id ( Inhibitor of dermal melanin- you may be right about this one @Amer !); B (barred); and Ko (head streak).
Thank you for the effort of sharing that, very interesting!
I'm hoping to keep the black eyes in my project, so I was curious about this thread.
As an aside: What is head streak?