I do not plan on breeding crested ducks, but I am curious about how the crested gene is passed. My understanding is that two crested birds should never be bred together because most of them will inherit a deadly gene. Is that true? And if you breed one crested duck to a non-crested duck, some will inherit the deadly gene, and x%will be crested and x% will be non-crested. So if I have this right, if I were to breed a white crested duck to say a Welsh Harlequin drake, would some end up crested, even though they are two different breeds? I was just curious, so thanks ahead of time for helping clear this up for me!