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A woman with blood type A and a man with blood type B are both heterozygous...

A woman with blood type A and a man with blood type B are both heterozygous for the recessive allele responsible for PKU.  Their first child has blood type O.  If these parents have two more children, what is the probability?

  1. First a girl and then a boy?
  1. Both have blood type O?

  1. Both boys, the first with PKU and the second without PKU?
  1. First a girl with blood type A and then a boy with blood type B, both with PKU?

e. At least one girl, both children with blood type AB?

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