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Paternity and Blood Type

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

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 ...

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.

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