A nurse is planning to teach the parents of a child with cystic fibrosis how the

A nurse is planning to teach the parents of a child with cystic fibrosis how the disease is manifested. Which of the following statements is the best explanation?
1. “While all people carry the gene for cystic fibrosis, those who develop the disease have a mutation in that gene.”
2. “A small percentage of the general population carries the gene for cystic fibrosis. If two carriers have children, then 25% of those children will develop the disease.”
3. “One in four people carry the gene for cystic fibrosis. If two carriers have children, then 25% of those children will develop the disease.”
4. “Some people carry the gene for cystic fibrosis. Of those carriers, one in four will develop the disease.”