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

Am I right with B?

Answer 2

Yep, only one of the offspring icons are completely filled...which that offspring has a 100% chance of having that disease

Answer 3

Thank you.

Answer 4

The other off spring have either a 50% chance or 0% chance. The offsprings with the Aa alleles have the 50% chance while the offspring with the AA allele has a 0% chance

Answer 5

Yeh, thank you

Answer 6

You're welcome