Just want to propose a hypothesis for this that I think might be at least somewhat correct, lemme know what you think, under the assumption that Yellowbelly / Spectre / Graphite are all alleles at the same locus:

Allele Pairings:
Yellowbelly Normal = Yellowbelly
Yellowbelly Yellowbelly = Ivory
Yellowbelly Spectre = Superstripe
Yellowbelly Graphite = Ivory Superstripe
Graphite Spectre = ?

This is assuming that Graphite is somewhere halfway between the original yellowbelly allele and the Spectre allele, which visually does seem to be the case.

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