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Phenylketonuria is an inherited disease caused by a recessive allele. People with PKU can't break down...

Phenylketonuria is an inherited disease caused by a recessive allele. People with PKU can't break down the amino acid phenylalanine properly; this compound and a byproduct can accumulate in the blood to toxic levels, causing mental retardation. A man and a woman are both normal, but they are carriers of the disease.

  

A) If they have children together, what proportion of the kids would be expected to have PKU?

B) What proportion of their children would be normal?

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