I had heard that buff and buff dundotte guineas were 'nearly' autosexing, but I didn't know they could be told apart as keets, I thought it was only when they had their adult feathers. I was just afraid that the difference would be too subtle for me! But the advantage would be as an autosexing color that it would breed true over the generations.
A sex-link color cross--- as in chickens or ducks--- I think depends on some color characteristic that is on the sex chromosome and that only females inherit from their dads. I'm not sure about much with guinea genetics--- I tried 'sex link guineas' on Ask.com and came up with hatcheries that sold sex-link chickens and regular guineas, plus a lot of vile stuff due to the word 'sex' being in the search.
I think if I were to try the experiment I would get Royal Purple or Violet from a hatchery that breeds the colors separate, like McMurray, and Buff Dundotte.
Of course the sex-link crosses only work in that first generation, but it might be handy, when selling guineas at a fur and feather swap, to have some, even at a young age, where you can be sure of the sex! Besides, might be fun to try.
