Jill is blood Type O. She has two older brothers (who tease her like crazy) with blood types A & B. What are the genotypes of her parents with respect to this trait?

There you have it.  Jill's parents are IAi & IB

Explanation:

one brother: Type B, one of the parents must have the IB allele

other brother: Type A,

other  parent must have the IA allele & have a genotype of IAi.

Jill's parents are IAi & IB

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