A couple plans to have children but is concerned about a rare genetic disease that is found in both of their families. The disease, cystic fibrosis, is inherited as a recessive disease following simple Mendelian genetics. The disease is characterized by lung congestion and infection and malabsorption of nutrients by the pancreas. Both the man and the woman have one sibling with cystic fibrosis. No other known cases are found in their families, including the couple. What is the probability that the couple's first child will suffer from cystic fibrosis? 1/4 3/4 1/3 2/3 1/6 1/9 4/9 9/64
Added by Judith P.
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This means they each have the genotype of "Aa" where "A" represents the normal allele and "a" represents the cystic fibrosis allele. Show more…
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