Ready to get technical ...
OK, if his Mum was palomino, that means her base colour was chestnut. She could have passed the dilution modifier on to him (that turns chestnut into pally), and turns bays into buckskins.
If his sire was black, he could be homozygous for black (ie carrying two black genes) or he could have the recessive chestnut gene, as black is always dominant. Not that it really matters, because your horse's base colour is definitely black, not chestnut.
Now, his dam also carries the agouti gene that turns blacks into bays. It's dominant, so if his sire carried it he would have been bay, so it must have come from his dam. It doesn't affect her colour because it only affects black, and chestnuts don't have any black.
Now, if your boy had only picked up the dilution modifier from his mother, he'd be a smoky black, as his base colour would still be black. He definitely picked up the agouti modifier from her, as he's not black. Now the question is, did he also pick up the dilution modifier to make him a dark buckskin, or is he bay?
So, the way to tell? Does he have a dorsal stripe? If he does, chances are he's buckskin, if he doesn't, I still reckon he's bay.
Last edited by Jenna; 03-13-2009 at 06:36 PM.