Co-dominant by definition is where the heterozygote exhibits the phenotypes of both homozygotes. Now let me try to explain this:
H = normal boa coloration
H* = the co-dominant hypo gene

Now if you cross an animal that is HH to an animal that is HH* then half of your offspring will be hypo and half will be normal. Now the ones that have the HH* will be hypo but they can look from either a really clean red normal or that beautiful thin saddle and no black pigment that everyone loves. Now if you were to cross an animal that was HH* to one that is HH* then your outcome is 1/4 normal, 2/4 possible super hypo and 1/4 super hypo. Now the reason there are possible super hypos is because some HH* snakes can look like super hypo that is H*H*. But some H*H* snakes you will see are just obvious supers because they have almost no saddles and have no black pigment. Therefore the heterozygous snakes that are HH* will show both a look of the HH and the H*H*. This means that this is a co-dominant gene. If it was a complete dominance than you would not see such a difference between hypos and super hypos. A complete dominance would not allow any of the normal coloration to come out in the heterozygous HH* individuals.

Now I am sorry if this is confusing but this is what I have learned in class and in studying this topic in general. If someone thinks I am wrong please show me how.
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1.1 Motley het butter corns
0.1 Snow corn
0.1 Okeetee corn
1.0 Anery mutt corn
0.1 Stripe Ghost corn
0.1 Amelanistic corn het carmel
2.1 Colombian Redtails
1.0 Hypo Colombian redtail
1.0 Brazilian Rainbow Boa
1.0 Anery Kenyan sand boa
0.1 Normal Kenyan sand boa

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