A woman found out about her Mom's infidelity when she learned her blood type was genetically impossible given her parent's blood types. 

When Anya walked into her Biology class at California State University, I'm sure she expected to go in, do the work, and move on with her degree pursuit. However, things took a turn when the professor began discussing blood type and how it's inherited by the mother and father's blood types.

When Anya told the professor that she was type AB and her parents were type A and type O, the professor explained that it's genetically impossible for the two to be her biological parents. When Anya returned to class the following day, she confessed that she had figured out where the inconsistency lied.

I mean at least she kept it in the family...

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