Technically a Cinnamon IS heterozygous for cinnamon and super is homozygous for cinnamon. Since it's a co-dominant mutation this just means the heterozygous genotype expresses the phenotype. They are still both heterozygous (1 copy) and homozygous (2 copies). The difference with a recessive gene is just that it only expresses the phenotype when it is homozygous in genotype.
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