Cystic fibrosis is a fatal genetic disease that affects one child in 1,600. It is an autosomal recessive gene. Both parents are heterozygous for this trait. A10) What are the phenotypes of each parent? A11) In terms of alleles, what are the different gametes each parent can produce? A12) This couple has had three children without cystic fibrosis. If the couple has a fourth child, what is the probability that it will have the disorder?

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