Family Pedigree and Cystic Fibrosis

Your sister has cystic fibrosis and you are contemplating having children of your own. Your mate recalls having a cousin with the disease. What is the risk that one or more of your children will have cystic fibrosis? If you can draw a pedigree of your family, assuming you have only one sister and your mate has only one sister.

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...are drawn with circles as females, squares as males, filled in with the disorder and empty without the disorder. Half filled in if carriers of one copy of the bad ...