opinion on sibling breedings

[Kryptonian]

I am interested on hearing how people view the breeding of a brother to a sister in snakes to get the morph you want. I am firmiliar with line breeing where you breed the offspring to the parent and that its common in many species especially livestock. Since the offspring only shares half of the parents genes there is enough that there isnt too many shared that you end up with deformities like you might if you inbreed. I have even line bred hamsters when I used to breed them to get the color I wanted to sell that breeders were not giving up the female of that color. It was a reccesive color so I line bred a female to her father to create my own female of that color. So in snakes are you not at the same risk of deformities when breeding siblings?
Eg, if I were to buy a male albino and a female axanthic and breed them the offspring would all be double hets. If you bred the offsping together there is a chance at snows, but is that safe to do? Any breeders that can share thier experience please do, thanks.

[Oxylepy]

From what I have learned people do it all the time and there really isn't any problem with it. But if you keep inbreeding them like that after a time there is a much higher chance of a genetic deformity presenting itself. But doing it with one generation? Sure people do it all the time.

[Toronto Python Gurus]

to prove a snake you pretty much have to breed siblings, NERD spent years tryin to prove out the spider gene, alot of people say thats why spiders have the head wobble, but every morph that has been produced or proved out came from the same bloodline, there is only one spider line out there which came from the original NERD spiders

[rabernet]

to prove a snake you pretty much have to breed siblings, NERD spent years tryin to prove out the spider gene, alot of people say thats why spiders have the head wobble, but every morph that has been produced or proved out came from the same bloodline, there is only one spider line out there which came from the original NERD spiders

The original spider had the head wobble - and spiders are some of the most outcrossed ball pythons, since they've proved to be dominant. I don't believe that inbreeding has anything to do with the spider wobble, FWIW.

[nevohraalnavnoj]

I recall some readings I did a while back that stated offspring-parent was in fact a much worse breeding than sib-sib. It was approximately: the offspring from offspring-parent would have identical gene copies for 50% of the genes, and sib-sib would be something like 37.5%.

I tried to dig up that page and couldn't find it.

Then I tried to do my own punnet square experiment to determine how many identical gene pairs offspring under the two breedings would have, and I keep arriving at sib-sib has more identical gene pairs.

Can anyone resolve this?

JonV

[littleindiangirl]

I believe sib - sib is worse than parent to offspring. Because each offspring will have the genetic make up from both parents, whereas, the parent will always have genetics that the offspring did not get.

I do believe with reptiles it is easier to get away with inbreeding or line breeding for a couple of generations.

[Kryptonian]

It was approximately: the offspring from offspring-parent would have identical gene copies for 50% of the genes, and sib-sib would be something like 37.5%.

Wouldnt that be best case scenario? I think it would be possible that sibs could share 100% of the same genes depending on which ones they inherit from the parents.Twins for example.

[asplundii]

Any given offspring shares 50% of its parents genes.

Any two siblings share 50% of their genes.

So parent x offspring = sib x sib

[nevohraalnavnoj]

Any given offspring shares 50% of its parents genes.

Any two siblings share 50% of their genes.

So parent x offspring = sib x sib

It is the "rule of halves"

This is exactly what I was getting in my calculation as well....

JonV

[nevohraalnavnoj]

Wouldnt that be best case scenario? I think it would be possible that sibs could share 100% of the same genes depending on which ones they inherit from the parents.Twins for example.

Sibs could, theoretically, share 100% of the same genes but statistically speaking (which makes sense since we are on the order of millions/billions of DNA base pairs) each sib shares 50% of its genes with other sibs.

Twins are indeed a counterexample.

JonV