Both Mrs. Grande and Mrs. Knowles had babies the same day in the same hospital. Mrs. Grande took home a baby girl, whom she named Next. Mrs. Knowles took home a girl, whom she named Surfboard. Mrs. Knowles began to suspect, however, that the child had been accidentally switched with Mrs. Grande’s baby in the nursery. Blood test were made; Mr. Grande was type A, Mrs. Grande was type B, Mr. Knowles was type A, Mrs. Knowles was type A. Next was type O, and Surfboard was type B. Had a mix-up occurred?

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Asked Nov 1, 2019
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Both Mrs. Grande and Mrs. Knowles had babies the same day in the same hospital. Mrs. Grande took home a baby girl, whom she named Next. Mrs. Knowles took home a girl, whom she named Surfboard. Mrs. Knowles began to suspect, however, that the child had been accidentally switched with Mrs. Grande’s baby in the nursery. Blood test were made; Mr. Grande was type A, Mrs. Grande was type B, Mr. Knowles was type A, Mrs. Knowles was type A. Next was type O, and Surfboard was type B. Had a mix-up occurred?

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Expert Answer

Step 1

Mr. Grande has type A blood. So, the possible genotype of Mr. Grande would be IAIA or IAi. Similarly, Mrs. Grande has type B blood. So, the possible genotype of Mrs. Grande would be IBIB  or IBi.  So, they can have children belonging to the blood type A, B, AB and O (if Mr. Grande has the genotype IAi and Mrs. Grande has the genotype IBi).

Step 2

As we can see from the Punnett\'s square, the offsprings can have all the 4 blood groups. So, it is po...

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IAi IBi х (Mr. Grande) (Mrs. Grande) IA Bi (B IAB (АB) [В IAi (A) ii (O)

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