What?? You answered your question with your first sentance. A YB is in a way, a het ivory but we dont call it het. Ivory is the super form of a YB. Niether of which is recessive gene. Recessive gene carriers are generally the ones refferred to as hets.
YB to YB could give you an ivory. The simplest way to put it would be to say (mathmatically incorrect though) a YB to a YB is a 1 in 4 possibility of getting an ivory. A YB to an ivory could be 2 in 4 chance and an ivory to an ivory would be a 4 out of 4.
Thats in laymens terms but unless you actually pair an ivory to an ivory there is no 100% guarantee that you will get a certain number of ivorys and there is always the chance that you may not get any. Its all based on the punet square.
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