Question

1. a blood test is done to see if one of the three men is the father of a child. this child has type o blood, the mother has type a blood. 1)man #1 has type ab blood 2) man #2 has type a blood 3) man has #3 has type o blood. which man cannot be the father? explain

Explanation:

To determine the possible father, we analyze blood type genetics. Blood type is determined by alleles: Type A can be \( AA \) or \( AO \), Type B \( BB \) or \( BO \), Type AB \( AB \), Type O \( OO \). The child has Type O (\( OO \)), so it must get an \( O \) allele from both parents. The mother has Type A, so her genotype is either \( AA \) or \( AO \). If she is \( AO \), she can pass an \( O \) allele. For the father to contribute an \( O \) allele, his genotype must have an \( O \) (i.e., \( AO \), \( BO \), or \( OO \)). Man #1 has Type AB (\( AB \)), so he can only pass \( A \) or \( B \) alleles, not \( O \). Thus, he can't be the father.

Answer:

Man #1 (with type AB blood) cannot be the father.