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Phenylketonuria is a recessive disease that leads to the build-up of toxic levels of the amino acid phenylalanine in the blood. Untreated phenylketonuria results in a variety of symptoms, including intellectual disability. However, phenylketonuria can be effectively treated with a low-phenylalanine diet.

Bill and Bob are brothers. Their mother has phenylketonuria.

Bill marries a woman with phenylketonuria. What is the probability that they have a child with phenylketonuria?

Bob marries a woman whose father has phenylketonuria. What is the probability that they have a child with phenylketonuria?

PLease show me how you drew this and got the answer. Thanks in advance.

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Beverley Smith
Beverley SmithLv2
28 Sep 2019

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