Pied-sided Bloodred – high 2014

Go to History for more details about the DIFFUSED / BLOODRED base mutation of this compound morph.

In 1997, we acquired a Bloodred female from an unknown corn snake breeder that had a few lateral patches ofwhite.  We bred her to one or two males over the next six years, but never reproduced the white patches, nor did we hold back any of her sons to breed back to her.  In 2003, she was bred to a male Bloodred that has considerably more white on his sides, but no white was demonstrated in any of the F¹ progeny.  Upon breeding two pairs of the F¹ babies together, approximately 50% of the F²s demonstrated various degrees of white on their sides.  Also, when breeding one of the F¹males back to the SMR original female, 50% of those progeny also had various degrees of lateral white patches.  This demonstrated that the SMR P/S Bloodreds were not alleles of the original male Bloodred gene that had similar random lateral white patches. 

At this time – in my opinion – insufficient data has been gathered to determine that P/S Bloodreds owe their atypical white lateral and facial markings to a gene mutation.  It is remotely possible that polygenetic traits are responsible for the atypical patches of white on the face and sides, based on confusing phenotypes.  While evaluation of Mendelian Phenotype Proportions points to the likelihood of a gene mutation, that cannot be definitely proclaimed at this time.

It is sometimes difficult to determine the inheritance of a trait or mutation when expression of the atypical feature is highly variable – as is the case with SMR P/S Bloodreds.  In other words, are the Bloodred siblings of P/S Bloodreds that lack lateral patches of white not P/S Bloodreds OR are they P/S Bloodred mutants that are at the lowest end of the 0-to-10 scale for white expression?  When proving the mode of inheritance via evaluation of Mendelian Phenotype Proportions in a single brood of snakes, visual expression is crucial.  Hence, if the expression of white in this morph can be so extremely variable, when citing the ratio of visual mutants compared to visual non mutants, the very description of inheritance can be in question.  I therefore honestly don’t know if P/S Bloodreds owe their distinctive pied-sided white appearance to a recessive mutation OR polygenic trait modifications. Breeding trials are constantly being evaluated.  The snag in this determination is the fact that there are many siblings of the P/S Bloodreds that lack white, but have the remarkably red sides that are devoid of markings (a virtually distinct collateral trait of SMR P/S Bloodreds).  This particular trait is not foreign to the base mutation, Bloodred, but in P/S Bloodred phenotypes, expression of this shocking red trait is definitely exaggerated, compared to non P/S Bloodreds in the hobby.  Hence, the question again, “are these non P/S Bloodred siblings of those with white, P/S bloods that are exhibiting no white OR is there an associative phenotype that exaggerates the red sides, even if they don’t exhibit lateral white?”.  Some have suggested that the lack of color in places (i.e. white patches) is an extreme expression of the genetic elimination of melanin/markings.  That perhaps the genetic erradication of markings – when expressed in its’ extreme – may eliminate not only the melanin, but the other chromatophore as well?

Aside from the random lateral white feature that is obvious in most members of this morph – compared to standard Bloodreds – is the extreme diffusion – even if they don’t demonstrate any of the randomly distributed white patches on the sides.  On most – even in the absence of lateral white patches – there is an obvious line of demarcation between the dorsal and lateral pattern fields – just above the half-way point on the sides (dorso–laterally).  This stark break line between dorsal and lateral markings also begs questions about the lateral white being a mutation OR variable expression of polygenetics.