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in Principles of Inheritance and Variation by (49.0k points)
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A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other off springs.

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The parents of the child will be heterozygous for their blood groups. Therefore, his father with blood group A must-have genotype (IA Io) and mother with blood group B must have genotype (IB Io).

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