A woman with type AB blood gave birth to a son with type B blood. Two different people claim to be the father. One man has blood type B, the other blood type A. Identify the correct statement.

# A woman with type AB blood gave birth to a son with type B blood. Two different people claim to be the father. One man has blood type B, the other blood type A. Identify the correct statement.

1. A

Man with blood type A is the father of the child

2. B

Man with blood type B is the father of the child

3. C

Either could be the father of the child

4. D

None of the claimants is the father of the child

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### Solution:

Woman- AB- ${\mathrm{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{B}}$
Boy- B- ${\mathrm{I}}^{\mathrm{B}}{\mathrm{I}}^{\mathrm{B}}$ or ${\mathrm{I}}^{\mathrm{B}}\mathrm{i}$
Male 1: B- ${\mathrm{I}}^{\mathrm{B}}{\mathrm{I}}^{\mathrm{B}}$ or ${\mathrm{I}}^{\mathrm{B}}\mathrm{i}$
Male 2: A- ${\mathrm{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{A}}$ or ${\mathrm{I}}^{\mathrm{A}}\mathrm{i}$

${\mathrm{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{B}}$${\mathrm{I}}^{\mathrm{B}}{\mathrm{I}}^{\mathrm{B}}$

${\mathrm{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{B}}$${\mathrm{I}}^{\mathrm{B}}\mathrm{i}$

${\mathrm{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{B}}$${\mathrm{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{A}}$

${\mathrm{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{B}}$${\mathrm{I}}^{\mathrm{A}}\mathrm{i}$

From all the above crosses it is evident that because of the uncertainty of the genotypes of the man claiming to be the father, it is not possible to predict the father and either could be the father of the child.

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