A pair of prospective parents is concerned about the risk of having a child with cystic fibrosis, because both the man and woman have a sibling who died from the disease. They undergo genetic testing and find that each carries one cystic fibrosis allele and one normal allele. What is the likelihood that their unborn child will have cystic fibrosis? (Recall that cystic fibrosis results from a recessive mutation.)

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    100% (All of their children will have cystic fibrosis.)
    0% (None of their children will have cystic fibrosis.)
    25% (The chance that this baby will have cystic fibrosis is 1 in 4.)
    50% (The chance that this baby will have cystic fibrosis is 1 in 2.)

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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25% (The chance that this baby will have cystic fibrosis is 1 in 4.)
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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