is there a lethal gene?

[chinchillachic18]

is there a lethal gene when breeding certain colors of ball pythons together?

(I breed chinchillas) and if you breed a White (Mosaic or Silver) chinchilla with another White (Mosaic or Silver) chinchilla, you create a lethal gene that kills homo white babies (pure white).

So you either get a regular grey baby or a White (Mosaic or Silver) baby.

So basically i was wondering if that happens with certain colors of ball pythons too?

just curious

[blackcrystal22]

is there a lethal gene when breeding certain colors of ball pythons together?

(I breed chinchillas) and if you breed a White (Mosaic or Silver) chinchilla with another White (Mosaic or Silver) chinchilla, you create a lethal gene that kills homo white babies (pure white).

So you either get a regular grey baby or a White (Mosaic or Silver) baby.

So basically i was wondering if that happens with certain colors of ball pythons too?

just curious

Hmm, well I know that there has never been a homozygous Spider ball python created, as they have never survived.
I don't know about Pinstripes though. I think with unusual dominant genes, it gets tricky.

[dr del]

Hi,

There are certainly a couple of combo's that might qualify from all I've read - there is, as mentioned, the strange dearth of homozygous spiders and also the "failure to thrive" problem with homozygous womas (pearl).

The last one seems to be ok in combination with other morphs though.

Anyone able to give any more info on those or others?


dr del

[chinchillachic18]

When you say they never survive what do you mean? Like they never hatch? or they do, but then die soon after

[WingedWolfPsion]

It's almost certain that Spider and Pinstripe genes are lethal when paired.

If they are truly dominant genes, then a Pin X Pin breeding should average 75% pinstripes, and 25% normals. Same with a Spider X Spider breeding.

If they are co-dominant, than only 50% of the offspring should be pinstripe, and 25% should be normal--25% should be missing (lethal). That should mean smaller average clutches than when the female is paired with a normal male.

Obviously it's not going to be easy to determine with such close odds, from the odds alone. But consider this--if the gene is truly dominant, then 25% of the pin or spider offspring born SHOULD BE super-pin or super-spider. Identical to a normal pin or spider, but producing 100% pin or spider offspring when bred to a normal. To the best of my knowledge, that has never happened--at least, no one has mentioned it.

If there are no super-pins, and no super-spiders, why? The only answer I can think of is that they never hatch.

[RandyRemington]

I agree that the public proven homozygous spider is overdue but there still could be other explanations. Maybe it's not a very presentable snake or there has been even less interest by breeders who would post the results in producing one that you would think. But it does seem likely if not proven at this point that spider is homozygous lethal (could never actually be proven beyond all doubt).

However pinstripe just might be the first proven dominant ball python mutation. In the 8/9 Reptile Radio interview at 66 minutes in BHB told about a pin that produced 22 pinstripe offspring in a row with no normals. He didn't actually say that the females where all normal for pinstripe but if they where the odds of a heterozygous pinstripe doing that would be over 1 in 4 million. Even if all the females where pinstripes the odds of not producing a normal would have been 1 in 560 and I think it's more likely he was testing his possible homozygous pinstripe male with non pinstripe females. He indicated the animal did not look different than a normal (heterozygous) pinstripe but didn't say anything about its behavior but it apparently was able to grow to breeding size and is a fairly good breeder.

[Freakie_frog]

It's almost certain that Spider and Pinstripe genes are lethal when paired.

How is it lethal its called a "spinner"

If there are no super-pins, and no super-spiders, why? The only answer I can think of is that they never hatch.

Brian of BHB claims to have produced a super Pin it looks the same as a regular Pin but throws all pinstripe offspring when bred to a normal. Brian is not the type to lie so I believe him

[Stewart_Reptiles]

To the best of my knowledge, that has never happened--at least, no one has mentioned it.

Or you did not listen when it was mentioned about Pinstripe

[AjBalls]

I'm a bit confused because it's a bit early for me, but if yous are talking about what I think yous are, then I don't think the Powerball (Spotnose x Spotnose) should be left out. From what I've heard, none have yet survived.

[Freakie_frog]

I'm a bit confused because it's a bit early for me, but if yous are talking about what I think yous are, then I don't think the Powerball (Spotnose x Spotnose) should be left out. From what I've heard, none have yet survived.

No.. its not Lethal the first one just had a box fall on it an killed it. Tracy told that on Reptile Radio. Its only fatal when you drop heavy objects on them.