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Dominant Genes?

salemserpent Oct 05, 2006 09:42 PM

Just a quick clarification. Normal is the only "dominant gene" for corn snakes, right? The rest are recessive?

Thanks.
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1.0 Green Iguana
1.0 Bearded Dragon
0.1 Blizard Leopard Gecko
2.1 Corn Snakes (2 Blood Red, 1 Orange Amelanistic)
1.1 Ball Python

Replies (5)

Kat Oct 06, 2006 11:00 AM

>>Just a quick clarification. Normal is the only "dominant gene" for corn snakes, right? The rest are recessive?
>>

More correctly stated, Normal is dominant to all other known cornsnake genes. (There's some question about whether 'bloodred' aka 'diffuse' can be considered co-dominant to normal, since a partial effect is often observed in animals which are het.)

In addition to Normal's dominance, the following atypical gene interactions exist. Motley is dominant to Stripe -- a cornsnake het stripe, het motley will appear to be Motley. (This is different from the partial striping that striped-motleys exhibit.) Also, Ultrahypo is co-dominant with Amel -- a cornsnake het ultra, het amel will appear to be somwhere inbetween hypo and amel, and is known as an 'ultramel'. All other gene interactions beyond these special cases appear to be plain ol' recessives with no odd alleles. So far.

-Kat
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This Space For Rent

salemserpent Oct 06, 2006 02:38 PM

Thanks. It seems kinda skewed when compared to snakes like Ball Pythons, but I guess thats the way it is. Maybe something has yet to be seen?
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1.0 Green Iguana
1.0 Bearded Dragon
0.1 Blizard Leopard Gecko
2.1 Corn Snakes (2 Blood Red, 1 Orange Amelanistic)
1.1 Ball Python

HerpZillA Oct 06, 2006 08:19 PM

>>>>Just a quick clarification. Normal is the only "dominant gene" for corn snakes, right? The rest are recessive?
>>>>
>>
>>More correctly stated, Normal is dominant to all other known cornsnake genes. (There's some question about whether 'bloodred' aka 'diffuse' can be considered co-dominant to normal, since a partial effect is often observed in animals which are het.)
>>
>>In addition to Normal's dominance, the following atypical gene interactions exist. Motley is dominant to Stripe -- a cornsnake het stripe, het motley will appear to be Motley. (This is different from the partial striping that striped-motleys exhibit.) Also, Ultrahypo is co-dominant with Amel -- a cornsnake het ultra, het amel will appear to be somwhere inbetween hypo and amel, and is known as an 'ultramel'. All other gene interactions beyond these special cases appear to be plain ol' recessives with no odd alleles. So far.

I will not dispute any of that, as she knows FAR more than I.
But genetic terms are used in a terrible manner. Co dom for corns may not be the same as boas. And IS NOT. Hypo is so called Co DOM in boas, although I believe it is dominent to normal. Which means you can have a het for normal, although a customer of mine says technically it is double het! I surrendered a while ago, to try to TOTALLY understand this.

But "co dom" "should" mean both traits show, (famous red and white rose) where as "incomplete dom" (famous pink rose) is one or the other shows.

Confused? it gets worse. Co dom genes can act like incomplete. And genes at adjacent alleles can effect that allele in various manners or degrees.

I only bring this up if you are looking at various species of snakes. Terms are not used universal. And this is the accepted practice, which makes no sense.

Similer idea of the same thing is corns are Amels while boas are albinos.

I hope I got that mess right, and did not confuse the issue more. But, one must be aware that not all herps use the terms the same.
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Thanks for reading.
Big Tom

www.herpzilla.com

salemserpent Oct 08, 2006 09:48 AM

Yes, I was just pointing out that it was funny that some species of snakes have lots of genes/patterns/whatever that can be considered dominant while corn snakes don't have any. I do understand that genetics is one big confusing mess. I'm still hammering out the details.
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1.0 Green Iguana
1.0 Bearded Dragon
0.1 Blizard Leopard Gecko
2.1 Corn Snakes (2 Blood Red, 1 Orange Amelanistic)
1.1 Ball Python

HerpZillA Oct 08, 2006 10:57 AM

Me to as far as hammering them out.

Yes colubrids seem to be quite different than boadaes.

Just think if there were 10-15 other groups of snakes being bred in the quanities of corns and boas and pythons.
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Thanks for reading.
Big Tom

www.herpzilla.com

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