Question

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 neither have the disease nor are carriers for the disease?

0%
25%
50%
75%

Answer 1

Answer: The answer would be 25% because their are 4 offspring and 50%(2/5) of the offspring are carriers while 25%(1/4) has the disease and the other 25%(1/4) doesn’t.