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How could two normal parents have a child with cystic fibrosis?

Question:

How could two normal parents have a child with cystic fibrosis?

What Is Cystic Fibrosis:

Cystic fibrosis is a recessive disorder that is caused by a mutation in a transport protein. The defective protein cannot transport salt, and thus decreases the movement of water between cells and the environment. This produces thick, sticky mucus that blocks the airways in the lungs and traps bacteria.

Answer and Explanation:

Two parents may be phenotypically normal, but still be carriers for the recessive gene. If each parent is a carrier, this means they have a...

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Cystic Fibrosis: Cause, Progression, and Treatment

from Pathophysiology Textbook

Chapter 9 / Lesson 16
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