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Paternity and Blood Type

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1. A mother wants to know the blood type of her son's father. What blood type would the father be if her son and herself are both type A+. Also, her (the mother's) brother is type 0 and her mom is A+. What blood type can the father be?

The father could be:
(a) A. A, AB, B, or O
(b) Either A or B
(c) Either A or O

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Solution Summary

This solution provides the best answer to a multiple choice biology question: A mother wants to know the blood type of her son's father. What blood type would the father be if her son and herself are both type A+. Also, her (the mother's) brother is type 0 and her mom is A+. What blood type can the father be? There are three choices: The father could be:
(a) A. A, AB, B, or O, (b) Either A or B, or (c) Either A or O. An explanation of why the correct answer is the best choice is provided, along with an informative supplementary diagram.

Solution Preview

The best answer if (a) A. A, AB, B, or O.

Therefore the father could be: A, AB, B, or O.

Why?

Potential blood types of father The mother in question is blood type A+. Her genotype at the ABO location is either AA or AO. Her Rh genotype is either Rh+/Rh+ or Rh+/Rh-.

The information that the maternal grandmother is also blood type A+ and a brother is blood type O tells us that the ...

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