SemaviLady - I am totally lost as by what you posted. The white Gene in GSD's is a masking gene not an albino gene. Which means that the White GSD can be any color that is in the GSD but that it is masking that color. So Sheena(my white) could be a bl&tn or a rd&tn or a full black but the white gene is masking her color so she is white. If she was bred to a colored GSD we would have no idea what colors she would throw in the pups because we don't know what color she is masking.

We do know when a wh is bred to a wh then they only throw white pups
when a white is bred to a colored that has the wh gene then they throw white and colored pups
when a white is bred to a colored without the white gene then they throw all colored pups. So the gene has to be in both the parents for the masking affect to take place.

And yes white coated dogs can have black or other colored fur come out int eh coat. In 3 years Sheena has had about 20 hairs that have been black appear on her neck and shoulders. Always one at a time but they do show up. And yes they are attached so I know they are not from our black Luca.

Agian I read what you posted but didn't understand half of what you wrote. I just posted what I know and what has been studied. if you want to learn more about the genetics of hte WS I suggest you go here: The White Shepherds Genetics Project. http://www.wsgenetics.org/

I am a contributing member to this project and the things they are learning and doing to better the WS is amazing.
Nicole