Quote:
Not necessarily, this is from Guinea Fowl Internationa:
"How pied birds appear is still open to debate. One current opinion is that you need one white gene to produce a pied bird, and two to produce a white bird. But I have discussed this with several good friends of mine who happen to be genetics professors at my local university, and between us we think that this is probably not the case. Their reasoning is, very simply, that pied birds have random splashes of white across them. You would almost certainly need two genes for this to happen: one which controlled the white, and one which controlled the random splashes. Two copies of the same gene could not control two completely different factors.
My opinion is also backed up by how pied birds happen in peafowl. You might want to go back to that peafowl genetics page that I referred you to earlier, where it explained much better than I have room for here.
In essence: until quite recently, it used to be thought that with peafowl, one white gene (T) led to a pied bird, whilst two (TT) gave a white bird. However, it is now apparent that you need both a pied and a white gene (PT) to get a pied peafowl, or two whites (TT) for a white bird. Peafowl with two pied genes (PP) are known as "dark pieds" and signal this effect by appearing to be a "normal" non-pied bird but with a few white flight feathers; birds with just one white gene (T) again look like a normal bird with white flight feathers (usually fewer in number than in the dark pied). If you have a pea with white flight feathers, but don't know whether it is a dark pied or a white cross, there is a foolproof way to find out: mate it with a pure white pea. You will get either 100% pied chicks (in the dark pied/white cross) or 50% white, 50% white cross (in the white/white cross mating).
Now, whether guineafowl use this same mechanism to produce their pied birds has not yet been confirmed and won't be until we do some selective breeding to test all the theories out. But at present I am betting on the "one white, one pied" formula and promise to let you know if this changes."