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31 March, 13:07

A woman is searching for her father and she has type O blood. She looks through records of men who could be her father. Which blood type can she eliminate from her search? (In other words, her dad cannot be what blood type.). Explain how you know this.

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  1. 31 March, 14:41
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    Answer: Blood type AB

    Explanation:

    In blood typing, three alleles A, B, and O are usually expressed. Alleles A and B are both dominant, while O is recessive.

    Hence, if her mother's blood type is B, and the father's blood type is O, then their child must be either B or O.

    Also, if both mother and alleged father have type A blood, then the child can only have A or O blood.

    However, if her alleged father has type AB blood, it is impossible for the recessive O gene to be transmitted to their child, since each of A and B gene are dominant and must be expressed in his child (the woman in question)

    Thus, the woman with type O blood would totally eliminate type AB blood as the possible blood type of her father
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