This group is just as confounding genetically as the Calico-Leucistic-Pied animals.
Breeding similar visual animals together so far has produced only normal looking offspring for us. So several questions still remain unanswered at this time.
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1) Like the Progressive Pied genetic trait, will the Granite look morph in over time?
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2) Or, as suspected with many Tokay genes, are the visual genetic markers in different animals in different places on their DNA strand because of locale separation over time. (Indonesia after all is a collection of Islands.)
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3)There has been at least one German breeder who produced a visual Granite at birth.
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4)Or, and this one is really fun; can the visual mutation be created from completely different genetic mutations?