What he means is that it takes multiple genes to produce a certain look to a GTP. The problem is that there are different ways of doing this, so a blue to a blue might not produce a blue, since they have different genes that produced that blue color. The genes individually wont produce blue, but they do together. I think if you have two blue GTP's from the same breeding, that they would have a better chance at producing blue GTP's, since its the same gene combination.
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