Technically a codominate can be het just like any other morph. Het is short for heterozygous which means there are two different alleles present. What makes a Codominate gene different from normal dominate forms or recessive forms is the heterozygous form looks different from the normal wild type and the homozygous (carrying two identical alleles) form. (sometimes called the 'super' form).

So, yes, leathers are hets but unless recessive genetic traits, they are expressed in the animal, recessive hets look like wild type as the trait is overruled by the dominate normal appearance. Codominate hets are expressed as well as the wild type look so it look different from a normal wild type and homozygous form.
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PHLdyPayne

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