Phenylketonuria (PKU) is a recessive genetic disorder. If both parents are carriers, what is the probability of this couple having a child with PKU? What is the chance of this couple having two children with PKU?

25%

Explanation: if you do the Punnett Square method then you would see that both parents would have been Dominant  for the trait, so there is a 50% chance of  the offspring to be a carrier, 25% chance of the offspring to have PKU and 25% chance for it to ave  

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