Originally Posted by Wheatermay
Ok, my other dumb question. How come his dam DIDNT express the bay or brown? I thought it was dominate? She just carries the gene? I'm a little foggy headed today, I'm sorry....
His dam was chestnut. Chestnuts do not express black in any way. Agouti (that causes bay and brown) only effects black hair. Therefore, chestnuts will not show whether or not they have Agouti.
More elaboration as an edit:
Bay and brown are black horses with the Agouti modifier. Agouti takes that black horse and says "hey, black, you're not allowed to be in this area anymore."
Since chestnut horses are not black, Agouti has nothing to modify. If a chestnut horse has Agouti, all it says is "I'm hiding cause there's nothing for me to do."