I looked it up and this is what I found:
"Albinism is caused by a recessive gene, meaning an animal must carry 2 copies of the gene, one from each parent, in order to express the color (or rather, lack there of). One copy of the gene has no effect on coat color. Because of this, 2 albinos bred together will always produce an albino. This simply does not happen in horses because no white horse's coat is caused by a recessive gene, and none of these white horses breed true as an albino would."
I really don't understnad genetics; can anyone explain this?