Hets?

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Would someone be willing to please explain hets to me? I do understand the basics: 50 het is a 50/50 chance of carrying a particular gene (eg. albino). Do they become 100% hets if they prove that gene?
As well, how do you get 66% hets?

Thanks in advance!

TK

PS Pic is of Anya, my 50 het albino girl (the snippy girl).