One you've seen a full set of muffs and beard, it is much easier to discern the single-gene ones.
Below is a picture of a young black pullet. Her muffs and beard are nice and full and closely frame her face - to the point where her eyes area almost lost behind the muffs. (edited to add following) As in all things Ameraucana, however, moderation is the key. We're not looking for the extreme muffs and beard of the Faverolle.
Then, when you look at the rather skimpy muffs and beards of the young blue wheaten pullet, it is easy to see the difference.
Having two copies of the muffs and beard genes has no correlation to eh color. I've had very full muffs and beards on second generation olive Eggers, but they laid an olive green egg.Edited by samouw - 1/30/16 at 5:46am