Reptile & Amphibian Forums

because i know of a few in ball pythons and i like codoms so i was wondering what corn morphs are codominant
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jake

my addiction:
1.1? normal ball pythons (lazlo and izzy)
0.1? amelenistic corn snake (zyklon)
0.1 blizzard corn (blizz)
hybrid breeders association
hybrid haven

Ultra is co-dominant...
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~Venom~

Hybrid Breeders Association

what does the het form look like?
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jake

my addiction:
1.1? normal ball pythons (lazlo and izzy)
0.1? amelenistic corn snake (zyklon)
0.1 blizzard corn (blizz)
hybrid breeders association
hybrid haven

I would call ultra a recessive mutant gene.

From what has been worked out, there are three alleles that could occur in the a (for amelanistic) locus in corn snakes. These are normal, ultra, and amelanistic. Amelanistic corns lack black pigment. Ultras have some black pigment but much less than normals. Both amelanistic and ultra are recessive to normal because the normal//mutant heterozygotes look normal. The ultra//amelanistic heterozygote looks more or less intermediate between an ultra and an amelanistic.

The closest to a codominant in corn snakes is a mutant that goes by a variety of names: diffuse, blood red, blood red pattern mutant, etc. This causes the pattern to be reduced on the back and absent on the belly. It was found in blood red corns but seems to have little to do with the color. People say that it's a codominant, but if so, the effect on the heterozygote is fairly subtle.

Paul Hollander

Not quite... you could say that ultra is codominant to amel, but it's certainly NOT codominant to normal. Ultra is recessive to normal.

I don't believe there are any true codominant genes in cornsnakes. People do say that bloodred/diffuse is codominant, because some hets show some of the characteristics, but it's highly variable. You can have a het that looks exactly like a normal corn and a het that could /almost/ pass for the homozygous form.

The only other weird gene combo I know of is stripe/motley. It appears that Stripe is recessive to Motley and both are recessive to Normal. Thus a snake het stripe het motley appears to be a Motley. A snake het motley het wildtype is a Normal.

-Kat
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