Eye colour, heritable phenotypic (observable) trait determined by pigmentation and light scattering in the iris of the eye. The iris, the coloured part of the eye, is the ring of muscle and collagen fibres around the central black opening of the eye known as the pupil, through which light passes.
The Genetics of Eye Color – HudsonAlpha Institute for Biotechnology
Is anything known about the genetics of eye color beyond brown, blue, or green? Like amber? - The Tech Interactive
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Solved Tris pigmentation (Eye Color) Polygenic Inheritance •