How het percentages work

[Mikoh4792]

If a snake is 66% het something, does that make it different from 66% pos het?

[KORBIN5895]

Nope. Same thing. You get 66% possible hets from two 100% hets. Basically 66% of the litter will be 100% het and 33% won't be. Unfortunately you can't tell which are het and which aren't so they call all of the babies 66% het.

[Mikoh4792]

Ah I see. So basically when a snake is labeled 66% het, they are saying that there is a 66% chance that the baby, is for lack of a better word, "100%" heterozygous?

[KORBIN5895]

Yep. Another term is possible het but that 66% sells more.

[franks]

I would like to add, that many people just say that because the customer cannot prove them wrong and hey feel it helps them sell the snake. Personally, I would not determine to buy a snake on a possible het- either you would want the het, or it is not completely necessary. Just my mindset.

[wrecker45]

I have a pair of 60% het albino hognose. the breeder said 25% of the babies should be albino. Is that correct.

[Mikoh4792]

I would like to add, that many people just say that because the customer cannot prove them wrong and hey feel it helps them sell the snake. Personally, I would not determine to buy a snake on a possible het- either you would want the het, or it is not completely necessary. Just my mindset.

So when exactly do you get a clutch of all definite hets? When do you get a clutch of a certain percentage of hets?

For example, let's say I have a het blahblah, and I breed it to another het blahblah, do all the babies become blahblahs and het blahblahs? or are some hets and some pos hets? What percentage of possible het blahblahs would there be?

[KORBIN5895]

Nope. Same thing. You get 66% possible hets from two 100% hets. Basically 66% of the litter will be 100% het and 33% won't be. Unfortunately you can't tell which are het and which aren't so they call all of the babies 66% het.

This answers your question Mikoh.

Roughly two out of every three babies will be 100% het. The third is not het at all.

They're are only two ways to know if an animal is het ( or 100% het , again just a sales term). Breeding a visual recessive produces hets ( or 100% hets). The second way is to prove a het out by breeding it to a visual recessive or another known het.

[smy_749]

I have a pair of 60% het albino hognose. the breeder said 25% of the babies should be albino. Is that correct.

Thats not possible..

[smy_749]

Mikoh, do some practicing with punnett squares and you will be good with the genetics in no time.

[KORBIN5895]

I have a pair of 60% het albino hognose. the breeder said 25% of the babies should be albino. Is that correct.

Unfortunately it looks like he lied to you. If the pair are only possible hets ( or 66% hets) then that means one or both may not carry the albino gene. Unless they both carry the albino gene you will not get any albinos. If they both turn out to be het ( or 100% het) then you should get about 25% albinos out of the babies. The normal looking babies will then be possible hets ( or 66% het) where ⅔ of them are actually hets and the other ⅓ are normals that don't carry the albino gene.

[Mikoh4792]

Unfortunately it looks like he lied to you. If the pair are only possible hets ( or 66% hets) then that means one or both may not carry the albino gene. Unless they both carry the albino gene you will not get any albinos. If they both turn out to be het ( or 100% het) then you should get about 25% albinos out of the babies. The normal looking babies will then be possible hets ( or 66% het) where ⅔ of them are actually hets and the other ⅓ are normals that don't carry the albino gene.

So if you breed two both visually recessive morph(albino for ex) animals together even then only 2/3 of the not visually recessive babies will be het? Is there never a clutch where all babies are hets?

[Mikoh4792]

Mikoh, do some practicing with punnett squares and you will be good with the genetics in no time.

W.i.l.l. d.o.

[smy_749]

alll babies are het albino when albino x normal. all babies are albino het albino with albino x albino.

[Mikoh4792]

Ah alright. So you only get those pos hets when you do het x het or normal x het.

[smy_749]

http://www.newenglandreptile.com/graphics/genetics/hetXhet.jpg

Na means het, so this way you can see, you will end up with 1/4 visuals , 2/4 hets and 1/4 who don't carry the gene at all (NN or aa it doesnt matter)

You can't tell which are the hets and which fourth doesn't, thats where you get 2/3 and 66%.

N is normal , a is recessive gene. So this is normal x het albino for example....
http://www.newenglandreptile.com/graphics/genetics/nXhet.jpg

This gives you 2/4 Hets and 2/4 normals. This is where you see 50% het stuff come into play. Hope that makes it clearer.

[Mikoh4792]

Yup that punnet square makes it a lot easier to understand. Appreciate it.

[lady_bug87]

alll babies are het albino when albino x normal. all babies are albino het albino with albino x albino.

Albino x albino give you homozygous snakes (visual albinos) if they're visual they aren't 'hets'

Unless you're talking about double recessives like toffee.

[smy_749]

I was just dumbing it down...I didn't mean het actually, I just mean that all the babies will also produce all albinos I guess. bad way to word it :S Hope the diagram makes it clear though lol

[lady_bug87]

http://www.newenglandreptile.com/graphics/genetics/hetXhet.jpg

Na means het, so this way you can see, you will end up with 1/4 visuals , 2/4 hets and 1/4 who don't carry the gene at all (NN or aa it doesnt matter)

You can't tell which are the hets and which fourth doesn't, thats where you get 2/3 and 66%.

N is normal , a is recessive gene. So this is normal x het albino for example....
http://www.newenglandreptile.com/graphics/genetics/nXhet.jpg

This gives you 2/4 Hets and 2/4 normals. This is where you see 50% het stuff come into play. Hope that makes it clearer.

I HATE punet squares

[smy_749]

I hate them when it starts to look like this...

http://scioly.org/wiki/images/c/cb/Trihybrid.jpg

[lady_bug87]

I do it in my head

[lady_bug87]

Ah alright. So you only get those pos hets when you do het x het or normal x het.

Here is a break down
Homozygous x Homozygous = Homozygous
Homozygous x 100% het = 1/2 homo/ 100% hets
Homozygous x 66% het =1/2 homo/ 100% hets

For homozygous to hets: if there are no homozygous in the litter/clutch they are all 100% hets

100% het x 100% het = 1/4 homozygous 3/4 66% het (1/3 normal 2/3 het)
100% het x normal = 50% hets (1/2 normal 1/2 het)

[Kid Boa]

I HATE punet squares

I agree Lady. :)