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In the case below, were the babies switched? How do you know whether they were or they weren’t?It was suspected that two babies had been exchanged in a hospital. Mr. and Mrs. Jones received baby #1 and Mr. and Mrs. Simon received baby #2  Blood typing tests on the parents and the babies showed the following: Mr. Jones: Type A Mr. Simon: Type AB Mrs. Jones: Type O Mrs. Simons: Type O Baby #1: Type A Baby #2 Type O    

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The alleles for A and B are codominant and the allele for O is recessive. In order to produce an individual who is type O, each parent must contribute an O allele. The only parents who could possibly do that is the Jones couple. That...

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