Chaplin met a young actress named Joan Barry, with whom he had an affair. The affair ended in February 1942 but, 20 months later, Barry gave birth to a baby girl and claimed that Chaplin was the father. Barry had blood type A and Chaplin had blood type O. If the child was actually fathered by Chaplin what would be the blood group of the girl?

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A blood group only

A or O blood group only

B blood group

AB blood group

answer is B.

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Detailed Solution

Joan Barry had blood type A, which can be produced by either genotype $I^{A} I^{A}$ or $I^{A} i$ . With blood type O in Chaplin, he produced only by genotype ii. Therefore the child could have either blood group A or blood group O. Any other type of blood group would prove that the child was not fathered by Chaplin.

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