Random genetic clarification

[fl_orchidslave]

Is there a t-pos in geckos at all as in snakes?

In snake breeding, and albino x albino is 100% albino offspring. Is this also absolutely true of geckos?

Is a Super Raptor gecko the only non-visual snow that can produce snow offspring?

 

[M_surinamensis]

Is there a t-pos in geckos at all as in snakes?

To the best of my current knowledge, all known strains of albinism in leopard geckos are tyrosinase positive. There are no t-neg amel leos.

In snake breeding, and albino x albino is 100% albino offspring. Is this also absolutely true of geckos?

That's not necessarily universally true in snake breeding... a few species of snake are known to have multiple strains of albinism, with different genetic causes that result in incompatibility when crossed. A kahl line and sharp line albino boa constrictor, for example, will produce a bunch of offspring that are heterozygous for both traits and phenotypically normal.

Strictly from a Mendelian perspective, crossing two animals that are homozygous for an identical recessive trait should produce offspring that are entirely homozygous for the same trait... but in practice genetics can be a bit trickier than that (though rarely, for the purposes of gecko breeding), since Mendel looked at transmission of isolated traits; rather than regarding organisms as being a collection of polygenetic influences forming the resulting traits and without taking into account mutations, factors that can supercede simple transmission and external influences.

Er... again to the best of my current knowledge, all the known strains of albinism in leopard geckos are simple recessives and crossing two animals each displaying the trait should result in offspring all also displaying it. Keeping in mind that misidentification of albino strains is not uncommon, that "best guess" labeling happens way more frequently than it should and that I'm not the a person who keeps up with the cutting edge projects and developments in the field of selective gecko mutating.

 

[fl_orchidslave]

Ahh yes, I had forgotten about the Kahl/Sharp lines. We sold our Sharp a few months ago. So theoretically, if one crossed those two lines, would it be a similar situation as in crossing Bell/Tremper?

 

[Dimidiata]

Is about the Diablo sunglow crossing that produced a seemingly MackS?

 

[M_surinamensis]

So theoretically, if one crossed those two lines, would it be a similar situation as in crossing Bell/Tremper?

Similar in some respects.

It'd produce animals that are heterozygous for both strains of albinism, while displaying neither. Those offspring would be substantially less desirable for future projects because of the ambiguity inherent in visually identifying which strain, or strains, are manifest if the line is used to produce albinos from those hets.

It's slightly worse from a herpetocultural/public opinion perspective, because the Kahl line has a genetic propensity for eye deformities and nobody likes the idea of having those problems crop up in non-Kahl projects.

It's not as bad from a herpetocultural/public opinion perspective because breeding projects with BCI are generally longer term, more effort and time intensive affairs and there isn't anywhere near the problem that exists with leos about unlabeled or mystery genotypes being used. There's an issue with subspecific and locale specific purity, but the morph market for the species is much, much simpler and most projects are better recorded. Leos can turn around so quickly, be so productive that things get much less clear much faster, making lineage more problematic to establish and trace.

 

[lillith]

Ok, I's ig'nant. What's a Kahl/Sharp Line?

n/m I searched it, it's a boa constrictor albino thing that leads to eye deformities, etc. Thanks.

 

[fl_orchidslave]

Thank you Seamus