I KNOW! I am getting used to this place! LOL I waited too long and it would not let me fix it! Here it is!
Chiilaa, Here was some research I had done. Perhaps this may be use full to others here concerning black roans and genetics. Very interesting!
Q: AA means no black or blue foals?
Q: aa means he is true blue right?
A: Correct Does that mean then he would be unable to produce bay roan at all even if bred with a bay mare? No, aa horses can produce bay-based colors if the mare they are bred to is either Aa or AA. But if an aa horse is bred to another aa horse (such as 2 blue roans, 2 blacks, a blue roan and black), then the foal can not be bay-based. I think this is what raised the flag with AQHA. They think your stallion is bay based (AA or Aa) because he threw a bay or bay roan foal from a mare that they think is black (aa).
Q: Aa means he can throw both right? Why should the colors be questioned?*****
A: If he is Aa (bay roan or brown roan, but not blue roan) then they should not question whether his foals are bay, bay roan, blue roan, or black unless photos that are sent in with the registration make them think that the foal isn't the color that the owner thinks the foal is. If he is Aa (bay/brown roan), then he can sire blue roan and bay/brown roan from a wide variety of mare colors.
Q: Another question is when researching a horses color history and one is able to see what is in his or her background, is it so far fetched to say some of those colors can surface , or doesn't it matter?
A: Some color genes can skip a generation...recessive genes like red can do this. For example, two black-legged horses bred together can produce a sorrel. And Agouti can surface visually...a sorrel bred to a black can produce a bay if the sorrel was Aa or AA for Agouti. Agouti doesn't show up visually on sorrels, as it only affects black-legged horses.
But dominant genes can not skip a generation. So two black horses can not produce a roan, because the true roan gene is dominant. Cream causes buckskins and palominos, and is dominant. It can't skip a generation. But, many people don't recognize a "smoky black" horse, which is a black that carries cream. So they can be surprised when a smoky black has a buckskin foal.
Dominant genes like Roan, gray, black (E, capital) can not skip a generation. Two sorrels can not have a black. So, it depends upon what gene you are talking about.
Still, he sure looked true blue in the pictures if I am thinking of the correct stallion. HOME: Grullo ( grulla ) quarter horses and blue roans at Cedar Ridge; reining, cutting, and roping