On the beginning Ivory was treated as recessive morph because of similarities between YB and Normals this is why people still calling YB as het for Ivory ( but going that way pastel is a het for super pastel, fire is a het for Lucy)...
With bigger knowledge about morphs at general Yb with have significant visual differences from wild type was classified as Co-dominant morph with super form - Ivory. Term "het" is now mostly used for non visual animals carrying recessive gene









I meant that although we don't usually talk about them like we do most hets because they're visual, the het idea still applies


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