This is how it has been explained to me by Randy of Alphadragonz...and id love to know eds explanation other than "they are different cause I say so":
Quote:
Red Italian Leatherback X American Smoothie
When we bought our original Smoothies from Anna at AC Reptiles we could only guess how their genetics worked. Thanks to Anna and Chad we found out last year that this trait is inherited in a Codomiant fashion. Well at the same time half way across the world a man by the name of Alessandro was working with a very similar genetic trait called Leatherbacks. Both of these traits affected the dragons in a similar way. This weekend we found out that both the Smoothie Trait and the Italian Leathrback trait are in fact most likely the same allele located on the same Locus. We accomplished this by Breeding a Red Italian Leatherback to an American Smoothie which resulted in some very healthy and amazing Silkbacks!! More information to come later!!
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This is a quote from Alphadragonz.com
What he has explained to me in a lengthy conversation is this,
The gene for reduced scaling (either LB or AS) is located on 1 chromosome, 1 allele, and 1 locus. This is the same in every dragon around the world...for all pogonia vitticeps.
Even though the ILB line is from different stock, the mutation has occurred on the same locus of the same allele as the AS.
This conclusion came about because of the silkbacks. It is the full expression of the reduced scaling mutation. If it were a different trait in both lines, then they would be incompatible.
This would mean that breeding an ILB with an AS would result in something other than a silkback. Because that breeding produces silkbacks, it therefore means that it is the same gene.
If someone has a different genetic explanation, im open to it, but i have taken many genetics courses as well as talked to both Randy and my Uncle who is a research geneticist with one of the top vaccine producers in the world, and this is the info I have.