If some Platys are het Lucy and others het Ultra:

Ultra X Norm = Platy (het Ultra);
Lucy X Norm = Platy (het Lucy);
Ultra X Lucy = 100% Ivory (double het for Lucy/Ultra);
Ivory X Ivory = 1/4 Lucy, 1/4 Ultra and 1/2 Ivory

Furthermore:

Some Platy X Platy = 1/4 Lucy, 1/2 Platy and 1/4 Norm
other Platy X Platy = 1/4 Ultra, 1/2 Platy and 1/4 Norm

If these statement are true then I understand Jordan. Anyone with actual 1st hand experience in these breedings?
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steve