Codominant and incomplete dominance are totally different.



Incomplete dominance shows a mixing of phenotypes of the two genes in the heterozygous form, hence the pink flower from a red and a white.



Codominant shows BOTH phenotypes simultaneously. If the red and white flowers are codominant, you will get red and white petals in the flower as opposed to a mix. If the petals form the same, then you will have white and red flowers on the same plant. Either way, you get both exact phenotypes and not a mix.



This is why dominant boa morphs would be classified as incomplete dominance and not codominance. If patternless were codominant, I dont think there would be a specific pattern on the motley. Heterozygous hypos are a little darker than supers and a little lighter than normals, demonstrating a mixing of the trait. Codominance here would show some hypo scales and some normal black scales on the heterozygous.
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It's just like the story of the grasshopper and the octopus. All year long the grasshopper stored up acorns for winter, while the octopus mooched off his girlfriend and watched tv. And then the winter came, and the grasshopper died, and the octopus stole all his acorns, and he got a race car. Is any of this sinking in?

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