In recessively inherited disorders, a carrier is an individual who has one copy of the recessive gene but does not exhibit the disorder. Cystic fibrosis is a recessively inherited disorder that runs in Ann's family. Ann has created the pedigree based on what she knows about her family's history.
Which individuals does Ann assume are carriers of the cystic fibrosis gene without performing any genetic testing?
a. Ann's father and brother
b. Ann's aunt
c. Ann's female cousin
d. Ann's sister