Ian and Bryony are both carriers for two autosomal recessive disorders, PKU (chromosome 12) and cystic fibrosis (chromosome 7). They are expecting a daughter. What is the probability that she will have PKU but not CF?
Added by Josefa L.
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The probability that their daughter inherits the recessive allele for PKU from both parents is 1/4 (since each parent has a 1/2 chance of passing on the recessive allele, and these probabilities are multiplied together). Show more…
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