Good point about how accidentally having a separate gene in a project doesn't effect the genotype outcome of the known gene you where working toward.

However, if you are breeding pairs both from this project that 2nd gene could affect your phenotypes down the line. Say you really liked the yellow and white contrast of the albino ball but didn’t care for the low contrast snow. If you started your albino ball project with an unexpected axanthic gene in a founder and then inbred you might produce some snows that you don't actually want (not the best example but depending on personal tastes snows could theoretically be a liability).

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