Hypo Costals genetics?

[alexander]

Hi,


Iv seen these Hypo Coastals you guys have in Australia, but Iv never read what the genetics are realy like.

Are they co-dom, reccesive or dom?

thank you.

Alexander

[hornet]

reccesive as far as i know

[munkee]

Not necessarily as simple as Mendelian genetics of Dominant, Recessive or Co-dominant. I'll leave the full explanation to people with biology majors at University to detail the nitty gritty.

[bredli84]

havn't researched myself even though have a genetics major. i would guess hypo would be recessive cos would be a mutation in a pigment gene. if snake has one mutant gene and one normal (wild type) then the pigment would still be produced so would appear to be a normal coastal. therefore would need both copies of gene to be mutant for the snake to be lacking in black pigment.
hope this helps.
oh, if someone thinks im wrong, speak up please.

[hornet]

you sound pretty right to me bredli84

[MrBredli]

As munkee said, it's not as simple as Mendelian genetics. Breeding hypo x hypo will not necessarily produce 100% hypos, but you will have a much higher chance of getting hypos then if you bred a standard x standard. It's like breeding two Coastals that have a green colouring - the parents aren't "het for green" but in all likelihood there will be alot of green babies. It would also be very possible for there to be no green babies at all.

[bredli84]

thats interesting MrBredli, i might have to look into that

[lacemonitor]

it would depend on the gene itself within the animal, and also would be interesting to get feedback on hypo question as yes u wouldnt get 100% but finding out how many would give a rough percentage on how strong the gene is but not necessarily determine dominant from recessive

the percentage of recessive is quite low compared to dominant but 2 of something will neva produce 100%

[TrueBlue]

when you cross a hypo with a normal you will get a hande full of hypos a hand full of inbetweens and the rest normals, if you cross hypo with hypo you get mainly hypos with a hand full of normals and inbetweens. So this would male it a dominant trait i belive.??

[junglist*]

True blue, youve just described a recessive trait

And it is pretty much as simple as mendelian genetics, however confusion and complexity are introduced by the fact that it is not just based upon a single gene. so therefore, many more recombinations are possible.

If you have a hypo, the trait is recessive, so you must be dealing with a heterozygotic individual. If you cross it with a Homozygotic dominant individual, you will get all heterozygotic individs. If you crossit with a heterozygotic normal, you will get a mix, but more heterozygotic dominant phenotypes.

As for the crozzing of 2 homozygotic hypos producing 'normal' offspring, multiple genes and recombinations just means that while the specimen will be homozygotic for one gene, it may not be for antoher.

Have a look online for the mendelian breakup of the pigmentation of labrador retrievers. They run along the same lines.

[TrueBlue]

sorry junglist but i think you maybe wrong.
if an albino,(recessive) is breed with a normal you will get all hets.

but cross a hypo with a normal you will still get a percentage of hypos, his i belive makes it dominant.

[junglist*]

Its not totally dominant true blue, its dependant on a variety of loci, so that is why you get the non typical spread of phenotypes.

You ahve no guarantee that the 'normal' you are breeding with is heterozygous or homozygous, so that explains the population phenotypes you have jut described.

The term “polygenic” means “multiple genes” are influencing a specific outcome. this is what is in action here. But quite clearly, if you cross the hypomelanistic specimen with a 'normal' speciman, you get mostly 'normals'.

Therfore it cant be dominant, or all offspring would be hypo.

[jordo]

I agree with junglist, it involves more than one gene hence is not as black and white as the albino example.
Also if it was a dominant allele at a single loci on the chromosome (only one gene) wouldn't you expect more hypo's in the wild (unless of course they are selected against)?
Anyway if it was from a single gene whether dominant or recessive there would be no inbetween phenotypes therefore it must be polygenic like junglist said.
(jmo)

[TrueBlue]

maybe its some where in between then, as you do get a fair percenage of hypo and hypoish animals out of a mating with a hypo and nornal, in fact most of the normals from the cluch dont seem to be the same as the previously breed normals when not breed against a hypo.?
when i say a hand full, to me they have to be very hypo, so there are probally more hypos to different degrees than what i first said.?
What would this make it,? also when 2 hypos are breed together you will get a few normalish ones as well.?

[Dragon2]

Junglist, I thought:
If Hypo x WT always gives a Normal phenotype the gene (s) must be recessive.
NERD suggests it is.
http://www.newenglandreptile.com/care.html
However, if this breeding SOMETIMES gives ghost (Hypo) offspring then one or more of the
genes causing the loss of melanin must be codominant.
I don't suppose we've done the long term documented breeding with genetically proven pythons the Americans have with Balls.?