Sally has Type B blood; Tom has Type A. Together they have three children: Child 1 has Type AB blood Child 2 has Type A blood Child 3 has Type B blood Tom thinks that he is not the father of Child 3 because of Child 3’s blood type. Sally insists that he is the father. Explain who is correct, using Punnett squares and linking genotypes to phenotypes. What are the genotypes of Tom and Sally?

He is not the father

Explanation:

Sally: A                          

Tom: B

We see that type A blood type is dominant over type B blood type therefore it would have been impossible for the child to have just B blood type

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