Cystic Fibrosis Is Caused by a Recessive Gene

question 67

Multiple Choice

Cystic fibrosis is caused by a recessive gene.If C = normal and c = cystic fibrosis,how can a child with cystic fibrosis have two parents who do not have cystic fibrosis?

• A) The child has a genotype of CC.
• B) The parents have genotypes of CC and Cc.
• C) The parents have genotypes of Cc and Cc.
• D) The child has a genotype of Cc.

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