Question

Chloe’s mother wants to have another child. However, she is concerned that a second child might also have CF, so she encourages Chloe’s stepfather to be tested. Tests reveal that he does NOT carry the CF gene. What is the chance that a second child born to Chloe’s mother and stepfather will have CF?

Answer 1

1 out of 2 chances. If he was tested for CF at a certain time, he may not have had CF strong enough for the radar to detect it. However, the mother may also carry CF, which could lead to a stronger chance of CF in the next child.