Jonah and Jana are siblings. Jonah has the genetic disorder cystic fibrosis, caused by inheriting one copy from each parent of a mutation in the CF gene (the "mutant allele" of the CF gene). Jana does not have cystic fibrosis. Which of the following statements is/are true? Jana does not have the CF gene. Jana has two copies of the mutant allele that causes cystic fibrosis. Jana has two copies of the CF gene. Jana has at least one copy of the non-mutant CF allele.

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