I think they're all 3 referred to as albinos because in each case the creation of melanin is defective. Each, however is defective due to a different gene involved.

When you cross a Tremper albino with a Las Vegas albino you get offspring with one defective "Tremper" gene with a good copy of that same gene from the Las Vegas albino. The offspring also inherits a defective "Las Vegas" gene and a good copy of the same gene from the Tremper albino. Because the "good gene" from each makes up for the corresponding "bad gene" in each parent, this means that creation of melanin can be accomplished and the offspring looks normal.

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