You pretty much have it. A Dominant trait will look the same whether the animal is Homozygous (HH) or Heterozygous (Hh). A Homozygous dominant bred to a normal will produce all Heterozygous babies of that phenotype. For example, the morph Champagne is *supposed* to be dominant. So a Homo Champagne bred to a Normal will produce all Champagnes, but they will be Heterozygous for that trait.

I think people mostly consider Spiders to be Codominant, but there is very little statistical or anecdotal evidence either way. I have never heard of anyone breeding a Spider to a Normal and producing all Spiders *every single time* which would essentially prove the animal to be a Homozygous dominant (or just extremely lucky).
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Lincoln, NE
0.1 Pastel, 1.0 Pastel het Pied, 0.1 Pied, 0.1 Cinn, 1.0 Black Pewter, 1.0 Woma (hidden gene?), 0.1 Yellowbelly
2.0 Normals, 1.0 Thayeri, 0.1 Thayeri X Alterna, 0.1 crazy cat, 1.0 husband

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