Travis and Marcy, a Caucasian couple, are pregnant with their first child. Travis has a prior child with cystic fibrosis

Question

Travis and Marcy, a Caucasian couple, are pregnant with their first child. Travis has a prior child with cystic fibrosis (autosomal recessive). He has refused to pursue carrier testing but Marcy has had negative carrier testing. Note: Carrier testing can identify 90% of carriers of CF accurately and approximately 1/25 Caucasian's are carriers of CF. What is the chance they will have a child with CF? 
1/140
1/25
1/964

Kunduz · Accepted Answer

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