Cystic fibrosis is a recessive gene disorder. The pedigree chart for a family known to have cystic fibrosis is shown below.

What percentage of the offspring either are carriers or have observable disease?

25%
50%
75%
100%

Cystic fibrosis is a recessive gene disorder The pedigree chart for a family known to have cystic fibrosis is shown below What percentage of the offspring eithe class=