The skin color is only sexlinked when the father has dark legs and the mother has light.
Reversing them (dark mom, light dad) gives chicks that cannot be sexed by color. You will get light legs in both genders, and you may also get dark legs in both genders if the father carries the gene for...
http://kippenjungle.nl/sellers/page3.html
According to this page, it's just one dominant gene.
http://kippenjungle.nl/breeds/crossbreeds.html
The chicken calculator considers it a dominant gene too (symbol Hf)...
I assume you got that prediction from the chicken calculator, but it would be talking about the adult pattern, which they may not have yet. Chicks with lacing, double lacing, spangling, and some other patterns can change appearance quite a bit as they go through several juvenile molts. The...