a blood test is done to see if one of three men is the father of a child. the child has type O blood, the mother has type A blood. Man #1 has type AB blood, man #2 has type A blood, man #3 has type O blood. Are there any men that can be ruled out as the father?

Man #1

Explanation:

Man #1 with type AB can be ruled out.

Mother - Ai

Child - ii

The father would have to have at LEAST one i allele.

AB makes it impossible to have i (you can only have 2 alleles).

The other two men, (Man 2 - Ai and Man 3- ii), have the possibility of being a father.

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