Can anyone explain Triples to me?

[SnakeySnakeSnake]

I was reading somewhere about genetics.... and now im more confused than ever about a few things


I see alot of 2x2 punnet squares, but then when talking about double and triple the punnet squares get bigger.... does this mean that these triples carry around 3x as many genes, or just that they have a wider variety?

I understand that a Het for albino carries a normal gene and an albinism gene, and that it can pass on one or the other.... but I dont get how a snake could also then carry genes for normal, albino, AND piebald... does anyone have a good explanation that i could understand ) I already went to one website that explained it out, and how a triple homozygous for 3 different traits could be used to produce alot of different stuff..

ok maybe im just tired, i will try this again tommorrow.

[rabernet]

Normal, piebald and albino would be a double het, not triple het. NERD has the best explanation, but you do have to have some patience and time to read through it all. I'd recommend starting with Introduction to Genetics and work your way through. Links to Heterozygous, Double Het, etc are at the end of each section.

[elevatethis]

So lets say you cross a homozygous albino x homozygous hypo, the resulting offspring would be 100% double hets for hypo and albino. Now, lets raise up one of the offsping and cross it with a homozygous pied. You would then have 100% pied hets that are also 50% poss double het for albino and hypo. After that, I'm not sure how you'd prove a true "triple het."

the rabbit hole gets deeper....

[JLC]

So lets say you cross a homozygous albino x homozygous hypo, the resulting offspring would be 100% double hets for hypo and albino. Now, lets raise up one of the offsping and cross it with a homozygous pied. You would then have 100% pied hets that are also 50% poss double het for albino and hypo. After that, I'm not sure how you'd prove a true "triple het."

the rabbit hole gets deeper....

Well, if you breed your Possible Triple Het to a known het or homozygous and they produce visible morph babies for each of those three traits. So...you breed your PTH to an albino, a hypo and a pied (assuming your PTH is male!) and if you get some of those babies in each clutch...then you have a definite Triple Het. It's a huge roll of the dice and quite possible that even though the het genes are present, they might not "take" in one or more of those clutches...so it may take a mating season or two, at least, to prove it out.

Obviously Triple Het combos will be pretty rare and amazingly expensive!

There may be a simpler way to prove them out, but that is one method that comes to mind when I think of it.

[cassandra]

Lol, I was thinking triplets. Check out this link on Bob Clark's Picture forums to tiger retic triplets. Pretty amazing; I hope all 3 make it!

Does anyone know the rarity of multiples in an egg? I would guess that twins are pretty rare and generally more "runt-y"? Anyone heard of many triplets? Just curious. =)

[elevatethis]

We were talking genetics.

Any takers on an efficient way to prove a triple het?

[ARamos8]

We were talking genetics.

Any takers on an efficient way to prove a triple het?

It's like DH's plus one more gene. I've been giving this some thought for a few months now. It's like JLC mentioned, breed the PTH to each morph and hope the genes prove out. It's just a time consuming process from what I am gathering here (if you don't have the stock). I would think that in either 18 months (male) or 24+ months (female) one could prove this out if there are 2 of each morphs in stock for dinking? Does that make sense? I hope so..LOL

Forgot to say: allow that much time for that generation to reach breeding size.

[ddbjdealer]

Any takers on an efficient way to prove a triple het?

PROVING a TH? Wow... Seems like it would take some time... MAKING a triple het? Like was mentioned earlier... except for SURE making a TH:

1.) 1st Homozygous x 2nd Homozygous = 100% DH's
2.) DH x DH = 1/16 Double Homozygous
3.) Double Homozygous x 3rd Homozygous = 100% Triple Hets!

Granted... these are not possibles... but guaranteed triples..

Also.. like was mentioned earlier... I would think the easiest... or only way (besides taking a stab at PTH x PTH) would be breeding a PTH male to homozygous females of all three morphs.... get enough eggs in all three clutches, and you should be able to prove some genes out.

Trips and Quads will be really cool as soon as someone gets around to doing them! lol (LOTS AND LOTS of time)

[SnakeySnakeSnake]

edited out.

[ddbjdealer]

Have you taken a look at NERD's genetics page? Their double recessive genetics page really goes into this quite well..