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Read up on Mendelian laws.

Or, in short, Breed he/she with a guinea pig you're POSITIVE is homozygous white. (White is recessive to black). If any of the offspring (out of at least four) are white, then the guinea pig you're talking about isn't purebred black.

That is in a laboratory setting. If, on the other hand, you're a sensible, cultivated, humane being who is simply curious as to the lineage of a beloved pet, then I can't help- I can only, and very sincerely, wish you both a happy life together.

And please, if you do end up breeding this guinea pig, make sure the pups find a good home. You'd be the reason of their existence, and you'd better man up to the consequences.

sincerely,

a guy who's cramming for AP Biology test &

who wishes we could just live and let live.

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Q: How can you tell if a black guinea pig is purebred or hybrid?
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