ReverseAlbinoOkeetee
New member
are their any co-dominant traits in corn snakes?
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Co-Dominant?
- Thread starter ReverseAlbinoOkeetee
- Start date
ReverseAlbinoOkeetee
New member
thats the only one?
So far, it is thought thatTessera is dominant .. not co-dom.
In the cornsnake world, co-dom means that two different genes share the same locus.
In the boa/python world, Co-dom means incomplete dominant (though some folks do stretch the lines on what incomplete dominant truly is).
Incomplete dominant means that it only takes one copy, of a gene, to have an effect upon the phenotype ... while two copies, of that same gene, would have an enhanced effect upon the phenotype.
For example, in horses, "Palomino" is an incomplete dominant ... Palominos carry one copy of the Cr gene while Cremellos (a cream to near white horse) carry two copies of the Cr gene. The Cremello coloring being an "enhanced" version of Palomino.
Dominant means that it only takes one copy, of a gene, to have an affect upon the phenotype ... BUT, unlike an incomplete dominant, two copies, of that same gene, has no more affect, upon the phenotype, than does one gene.
In the boa/python world, Co-dom means incomplete dominant (though some folks do stretch the lines on what incomplete dominant truly is).
Incomplete dominant means that it only takes one copy, of a gene, to have an effect upon the phenotype ... while two copies, of that same gene, would have an enhanced effect upon the phenotype.
For example, in horses, "Palomino" is an incomplete dominant ... Palominos carry one copy of the Cr gene while Cremellos (a cream to near white horse) carry two copies of the Cr gene. The Cremello coloring being an "enhanced" version of Palomino.
Dominant means that it only takes one copy, of a gene, to have an affect upon the phenotype ... BUT, unlike an incomplete dominant, two copies, of that same gene, has no more affect, upon the phenotype, than does one gene.
ReverseAlbinoOkeetee
New member
lol thanks guys
Susan
Go Ahead, Make My Day!
To expand and avoid (or add) confusion, in the corn snake world, amel and ultra are truly co-dominant as they share equal expression when paired with each other. However, the alleles motley and stripe are not, as motley is dominant over stripe (and we're not even going to talk about cubed
).
ReverseAlbinoOkeetee
New member
thanks for clearing that up susan lol
SickPyth7
Snakes
However, the alleles motley and stripe are not, as motley is dominant over stripe (and we're not even going to talk about cubed
SORRY I missed this part!
SickPyth7
Snakes
So how many breeding trials are needed to rule out either Dominant or Incomplete Dominant?
Tessera will have to be bred to Tessera, and then ALL of the resulting visual Tessera offspring (if there is nothing odd looking that would indicate "this is the homozygous form of Tessera") will have to be tested against normals.
If any one Tessera-looking animal produces at least seventeen Tessera offspring and zero non-Tessera offspring, it's a 99% chance it's homozygous for Tessera - and has then proved that Tessera is a true dominant trait that does not have a visually distinctive homozygous form.
That said, there is no sense in asking "are there any codominant traits in corns" because traits by themselves are not codominant, recessive or dominant - those words refer to how a trait relates to other versions of the same trait (alleles) on the same gene pair.
For example, Motley is a recessive trait when compared to Blotched (the normal pattern allele). However, it is a dominant trait when compared to Stripe.
Amel and Ultra are both recessive to normal, but codominant to each other.
