So what's your answer? Two fathers for one chicken? That seems far more unlikely to me. In fact, it is impossible.I will have to disagree here. Isn’t the fibro gene dominant? Shaggy would have a lot more indications that she carried it (and some hints to where she got it from!) if she did carry it. And for it to pop up when crossed with a white-skinned bird who’s got no fibro in his heritage…it’s about as likely as some crazy genetic mishap what wound up making a chick with two fathers.