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Cystic fibrosis is an autosomal recessive disorder. Beth and Tom do not have cystic fibrosis but...

Cystic fibrosis is an autosomal recessive disorder. Beth and Tom do not have cystic fibrosis but each have a sibling with cystic fibrosis. Beth's parents and Tom's mother do not have the disease., but Tom's father does. Calculate the probability that if this couple has a child, the child will NOT have cystic fibrosis.

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