A couple with a newborn baby is troubled that the child does not resemble either of them. Suspecting that a mixup occurred at the hospital, they check the blood type of the infant. It is type O. Because the father is type A and the mother type B, they conclude that a mixup has definitely occurred. Are they correct? Give reason for your answer.
A couple's thinking that a mixup has definitely occurred is incorrect.
Because the probable genotypes of mother with blood group B can be IBIB or IBIo. Similarly, the probable genotypes of father with blood group A are IAIA or IAIo.
Therefore, the probable genotypes of the children will be IAIB , IAIo, IoIo or IBIo. Thus, the children have the probability of having blood groups AB, A, B and O.
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