This is exactly the answer. Its called co-dominance. Most traits are not so easy to define as dominant and recessive. I just finished a genetics class and you wouldnt believe how complicated that stuff is. Basically there are several genes that control hair and unlike dominant/recessive genes that show either one trait or the other, co-dominant traits show a blend of both. The example out teacher frequently cited was snapdragons. A red snapdragon (flower) and white snapdragon will have some pink "babies" along with red and white. The traits blend together.