What Makes What and Het Info

I'm trying to put together a little guide of morphs for myself so I can understand this stuff, so I was wondering if anyone could possibly direct me to a site that tells you what the morph is, whether its dom, reccessive, co-dom, what two snakes you have to breed to achieve it, and any information on hets.

I don't quite understand the genetics of snakes. Supposedly, I have a 100% Het Pied male. How do they know its het? If it is 100% Het does this mean they bred two pieds together so it is a sure thing that any normal looking offspring would be 100% Het. What does 66% Het mean? I know there are more % Het but if someone could explain.

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Originally Posted by Jay_Bunny

I'm trying to put together a little guide of morphs for myself so I can understand this stuff, so I was wondering if anyone could possibly direct me to a site that tells you what the morph is, whether its dom, reccessive, co-dom, what two snakes you have to breed to achieve it, and any information on hets.

I don't quite understand the genetics of snakes. Supposedly, I have a 100% Het Pied male. How do they know its het? If it is 100% Het does this mean they bred two pieds together so it is a sure thing that any normal looking offspring would be 100% Het. What does 66% Het mean? I know there are more % Het but if someone could explain.

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As far as a resource to learn what you have to breed together to make designer morphs, the BEST source is one you have to pay for:

http://www.newenglandreptile.com/ava...&cat=33&page=1

As far as simple recessive genetics (which is how Pied works), I wrote an article quite some time ago that might help:
http://redtailboa.net/forums/how-tos...t=genetics+101

That should explain what hets are and where those pesky percentages come from. If not, post here again and I will do my best to answer any specific questions you may have.

Incidentally, to answer the most specific question from your post: if your snake is 100% het pied, that means that ONE of it's parents is Pied. The other parent could be normal or het, but for it to be a 100% het, one had to be a pied.

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Originally Posted by Jay_Bunny

Supposedly, I have a 100% Het Pied male. How do they know its het?

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Because you should have purchased it from a reputable breeder with a genetics guarantee.

It was only my second reptile expo ever. I don't know who's good and who's not. I actually went with the mindset that I wasn't getting another snake until December, but these two babies caught my eye. Next time I will make sure to seek out a breeder I know to be good.

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Originally Posted by rabernet

Because you should have purchased it from a reputable breeder with a genetics guarantee.

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So true. But would be awesome to know if you bought a normal to prove out its a het.

Heres a good site, but doesnt answer your question. Maybe someone else might run into it and might find it useful.
http://www.ballpython.ca/genetics.html

Im still trying to understand it too.

Thanks for the link. It definatly helped me understand hets a little more. I get how the outcomes work now. :D

Oh and rabernet, I think you took my question the wrong way. I was asking how they knew the snake was het, meaning I was wondering how you could tell a ball python was het for something when they have normal markings. Now that I've looked over the information provided, I know that if the breeder bred a homozygous individual with a het or normal, all offspring would at least be het for the trait, therefore having the 100% het put it front of its name.

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Originally Posted by Jay_Bunny

Oh and rabernet, I think you took my question the wrong way. I was asking how they knew the snake was het, meaning I was wondering how you could tell a ball python was het for something when they have normal markings. Now that I've looked over the information provided, I know that if the breeder bred a homozygous individual with a het or normal, all offspring would at least be het for the trait, therefore having the 100% het put it front of its name.

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Ahh, gotcha - I think I did read it wrong. I thought you were asking how did YOU know that yours was 100% het.

Nope. And if it turns out that Xefaud is not a het for pied, then I still love him all the same and I will purchase a het from another breeder that I have researched. I've already started looking at some breeders that sell online. 8-Ball, for one. My fiance said I could get another ball python as soon as we got our own apartment, so I'm saving up my pennies!

Hang on, im trying to learn as i read this too...
If you set up a punnets square, say with a Het for albino, and a Normal, the offspring will all be Het, none of them will actually be albino.. right? So if one was to invest in a 100% het for albino, in order to produce albinos, you would have to breed it with either another het, or an albino, correct? Bred with a normal will only produce more hets? ...i think... :confused:

If you cross a het and a normal, each of the offspring have a 50% of being het and a 50% chance of being normal. If you cross two hets, you have a 25% chance of having homozygous recessive individuals which would then display the morph trait, 50% chance of hets, and 25% chance of normals. Crossing a het and a homozygous individual will give you a either all hets or hets and homozygous individuals.

Am I right? Someone correct me if I'm wrong.

Cross Two Hets

---A a

A AA Aa

a Aa aa


Cross Het and Normal

---A a

A AA Aa

A AA Aa


Cross Het and Homozygous

---A a

a Aa aa

a Aa aa


Cross Normal and Homozygous

---A A

a Aa Aa

a Aa Aa

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Originally Posted by Jay_Bunny

If you cross a het and a normal, each of the offspring have a 50% of being het and a 50% chance of being normal. If you cross two hets, you have a 25% chance of having homozygous recessive individuals which would then display the morph trait, 50% chance of hets, and 25% chance of normals. Crossing a het and a homozygous individual will give you a either all hets or hets and homozygous individuals.

Am I right? Someone correct me if I'm wrong.

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Your math is correct, and you even worded it correctly in that each animal has x% chance of being het or normal.

The mystical 66% possible het comes from that het x het breeding... you are correct that 25% of the babies should be homozygous. The other 75% look normal, so you can't tell the hets from the normals. That is why each normal appearing snake has a 66% chance of being het.

The homozygous x het breeding should result in half of the babies being homozygous and half being 100% hets.

... oh and, your Punnett Squares are correct as well. Good work. :)

Legend for Jay Bunny's punnet squares:

AA = Normal
Aa = Het
aa = recessive morph trait.

Well done on that one :)

Thanks. At the moment, I'm working on a list of all the morphs I can find. I'm using this link to find information on morphs.

http://www.newenglandreptile.com/ner...=543&Itemid=76

Lots of good information there. It will help me understand what you get when you cross two different morphs. I'm trying to understand all this :rolleye2:

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Originally Posted by Jay_Bunny

Thanks. At the moment, I'm working on a list of all the morphs I can find. I'm using this link to find information on morphs.

http://www.newenglandreptile.com/ner...=543&Itemid=76

Lots of good information there. It will help me understand what you get when you cross two different morphs. I'm trying to understand all this :rolleye2:

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Buy the book. I'm serious. It will un-boggle you. :sunny:

Which book?

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Originally Posted by Jay_Bunny

Which book?

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http://www.newenglandreptile.com/ava...&cat=33&page=1

This one! ;)

http://www.newenglandreptile.com/ava...bookcover2.jpg

Wow! That book is definatly going on my X-mas list. Can't get it now. :(

According to that model if you bred an albino with a normal you should get all het albino, correct?

Well I was looking on Cypress Creek Reptiles and they bred albino and normal and resulted in 2 albino and 3 het albino.
http://www.cypresscreekreptiles.com/clutchbyclutch.htm

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Originally Posted by FIREball

According to that model if you bred an albino with a normal you should get all het albino, correct?

Well I was looking on Cypress Creek Reptiles and they bred albino and normal and resulted in 2 albino and 3 het albino.
http://www.cypresscreekreptiles.com/clutchbyclutch.htm

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Their "Regular Ball Python" was a het. And they got 5 albinos (2.3 = 2 males and 3 females) and 3 hets. They didn't say it was a het, but it was.