Here are some facts.
White skin, (W) is dominant to yellow skin (w) in all cases (Genetics of the Fowl, pg 151, Hutt, 1949).
Shades of color in the shanks are due to a combination of the melanin in the varying dermal layers of the skin.
1) White shanks= white skin (W) with no melanin in the epidermal layer of the shanks.
2) Yellow shanks= yellow skin (w) with no melanin in the epidermal layer of the shanks.
3) Bluish= White skinned bird (W) not obscured by melanin in the epidermis but influenced by its presence.
4) Slate or Black= in white skinned (W) birds, when partially or wholly obscured by the epidermal melanin.
5) Willow, or Green= in yellow skinned (w) birds, from the mixture of dermal melanin and epidermal xanthophyl.
The various shading and degree of shading of the slate or willow color will depend upon the level of melanin in one or all of the three dermal layers of the skin. But the facts are , the basil white skin (W) is dominant to yellow skin (w).
References:
Genetics of the Fowl, E. B. Hutt, Chapter 6, Variations in the Color of the Skin, pg 149-161, 1949
White skin, (W) is dominant to yellow skin (w) in all cases (Genetics of the Fowl, pg 151, Hutt, 1949).
Shades of color in the shanks are due to a combination of the melanin in the varying dermal layers of the skin.
1) White shanks= white skin (W) with no melanin in the epidermal layer of the shanks.
2) Yellow shanks= yellow skin (w) with no melanin in the epidermal layer of the shanks.
3) Bluish= White skinned bird (W) not obscured by melanin in the epidermis but influenced by its presence.
4) Slate or Black= in white skinned (W) birds, when partially or wholly obscured by the epidermal melanin.
5) Willow, or Green= in yellow skinned (w) birds, from the mixture of dermal melanin and epidermal xanthophyl.
The various shading and degree of shading of the slate or willow color will depend upon the level of melanin in one or all of the three dermal layers of the skin. But the facts are , the basil white skin (W) is dominant to yellow skin (w).
References:
Genetics of the Fowl, E. B. Hutt, Chapter 6, Variations in the Color of the Skin, pg 149-161, 1949