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Cystic fibrosis is a deadly disease of the lungs and digestive system. It is inherited as a recessive trait. How can two healthy parents have a child with cystic fibrosis?

User Emanouil
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The parents may possess the recessive trait. Let’s say both parents have the allele of Aa, where ‘a’ is the trait for cystic fibrosis, there is a chance that their child will posses the allele ‘aa’, meaning they would have the disease.
User Castles
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