Posted by:
Rextiles
at Fri Nov 19 12:45:36 2010 [ Email Message ] [ Show All Posts by Rextiles ]
Troy,
You bring up some good questions that are rearely asked...
Thanks Gregg!
I truly hope that nobody thinks that I'm trying to challenge the establishment (meaning all of us reptile breeders) or worse, trying to redefine the standards of genetics. If anything, I'm just trying to get a clear understanding of something that is either overly complex or so watered down that either way forces most of us into making interpretations based on our own presumptions. I will say that some of these topics do challenge the tenets long held by some in the herpetocultural world where a change of ideas is not so easily or readily accepted. I can only hope that through respectful debate and diligent research can we come to a more informed and correct consensus about such complex topics. While the internet is an invaluable source of information, it's also a terrible repository of misinformation, especially in some of the more popular forums that I've come across and/or belong to.
Another point that has suprizingly not been brought up is the fact that when two different recessives are bred together, the resulting offspring are normal in color... So you see no results in the first generation... With incomplete dominance you see the results in the first generation...
Correct, Incomplete Dominance is specifically defined by the appearance of the F1 generation unlike the Double Recessive Homo (DHR) that will only result from an F2 generation (or later based on the odds of producing such a mutation).
When an animal is doulble honozygous the reason you are able to see both traits is because the two recessives ride on different loci...
With incomplete dominance, the blending happens on the same loci...
Yes, I believe that is what I failed to recognize when I made the statement that the DHR's are showing Incomplete Dominance instead of asserting that they are merely mimicking the blending aspect of Incomplete Dominance.
While I still don't fully agree that a Snow is literally showing both Albino and Axanthic colors at once and yet somehow appear to blend and come across as a Snow colored individual, to me, I presume that the blending is happening in much the same way as it does in Incomplete Dominance traits despite the gene loci and recessiveness of the traits, I just can't understand how it would happen otherwise. However, I wouldn't argue that the genotype could be interpreted in that way considering that both the Albino genes and Axanthic genes are paired in a way that would be phenotypic of either of those individualistic mutative colors. So, from that perspective I can understand how some do come to the conclusion that both colors are being shown at the same time which is resulting in the blending of colors instead of the blending taking place on a more genetic level as I presume.
At least that how I understand it...
Hey, everybody's input is very welcome. I know I am learning things, either directly or indirectly, from everything that is being said in these threads by all of you choosing to participate on this topic. I find it mentally stimulating and very worth the time I've spent researching and corresponding with all of you; I hope you all feel the same. Thanks again for sharing your time and knowledge! 
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Troy Rexroth
Rextiles
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RE: Rextiles and others... - Rextiles, Fri Nov 19 12:45:36 2010
