Question about recessive hairless genetics

[bad-one]

Here's pics I took earlier when cleaning cages
The albino (mr. jingles) definitely has his dads possum face!






I can't find my rat breeding records atm, but they are over 2 months old, probably around 3

[snakesRkewl]

rex X rex =

25% super form(double rex)
50% rex
25% normal coat

Rex X normal = 50% rex 50% normal coat

It is too a co-dom trait

Double rex is like a super pastel, breed it to a normal coat and you make all rex's

[Rhasputin]

Lmao. No. Rex is dominant.
It's not co-dom. What's it co-dom with?

If it is co-dom, hypothetically, then what would the ratio be if it WAS dominant?

[Rhasputin]

Check out the AFRMA page on rex rats. Here's a quote for you, "Breeding Rex Rats
The Rex characteristic in rats is somewhat unusual in that it is dominant (I will put a qualifier on this and say that the Rex rats we commonly have in the fancy are dominant Rex).

This means that if you breed a Rex rat to any standard coated rat, half the babies in the litter will be Rex (if the genetics dice roll as they should). This makes it easy to produce more Rex babies. Keep in mind that standard coated rats produced out of Rex breedings do not carry Rex. Because Rex is a dominant gene, if it is there, you can see it!"

[snakesRkewl]

I'm confused, I've made almost 200 liters and I know the odds, as far as I know it's no different than breeding snakes when it comes to recessive, co-dom and Dom traits.

I'm no genetics wizard, but when a trait makes a homozygous form how can it be considered a dominate trait?

From AFRMA:
When breeding Rex, it is not advised that two Rex rats be bred together. When a baby rat gets Rex from both its mother and father, its coat leaves a lot to be desired. Typically these “homozygous” Rex rats range from nearly hairless to haired with a very thin patchy coat. These rats, though often very sweet, can best be described as mangy looking. They are certainly not particularly attractive.

In the same paragraph they say it's a Dom trait and then say it has a homozygous form, what's up with that?

[tomfromtheshade]

When you breed a rex to a normal its a roll of the dice. You will get some rex babies. Sometimes I get two rex babies, sometimes more, sometimes half the litter is rex. Its co-dominant meaning that some of the babies will be rex and some will be normal.

[snakesRkewl]

When you breed a rex to a normal its a roll of the dice. You will get some rex babies. Sometimes I get two rex babies, sometimes more, sometimes half the litter is rex. Its co-dominant meaning that some of the babies will be rex and some will be normal.

Exactly, I get pretty much 50% rex or velveteen when I breed them to normals.
I also get 100% rex or velveteen out of a double rex x normal breeding.
I don't get how they can call it a Dominate trait when it seemingly makes a super(Homozygous) form.
Or?

[Rhasputin]

Here, maybe this is where the misunderstanding between you, in the reptile buis, and me in the mouse buis, happens.

Quoted from Pythons.com
"Codominant - A mis-used term in the reptile world. The more correct term is incomplete dominant. It is when the heterozygous animal has a different, intermediate phenotype compared to the homozygous dominant or homozygous recessive individuals. A classic example of this is the Lesser Platinum mutation, where the heterozygous individual (Pp) is a Lesser Platinum, but the homozygous phenotype (PP) is Leucistic."

More close to how I understand it. Quoted from NationMaster Encyclopedia
"Codominance - a relationship among alleles where both alleles contribute to the phenotype of the heterozygote"

[TessadasExotics]

Here, maybe this is where the misunderstanding between you, in the reptile buis, and me in the mouse buis, happens.

Quoted from Pythons.com
"Codominant - A mis-used term in the reptile world. The more correct term is incomplete dominant. It is when the heterozygous animal has a different, intermediate phenotype compared to the homozygous dominant or homozygous recessive individuals. A classic example of this is the Lesser Platinum mutation, where the heterozygous individual (Pp) is a Lesser Platinum, but the homozygous phenotype (PP) is Leucistic."

More close to how I understand it. Quoted from NationMaster Encyclopedia
"Codominance - a relationship among alleles where both alleles contribute to the phenotype of the heterozygote"

What most Ball Python breeders know about Genetics is wrong. Well not totaly wrong, its close and easy to understand but its not 100% accurate.

[tomfromtheshade]

The thing that annoys me the most about hairless is the constant little dings, nicks, and scratches that they get. I feel like I should be putting neosporin on them daily LOL. Imagine how many little cuts you would get if you walked around naked all the time. With no hair they get scratched so easily.