Thorson, who sat out the 2014 season behind Trevor Siemian, beat out fifth-year senior Zack Oliver and redshirt sophomore Matt Alviti for the starting spot.
Thorson, a native of Wheaton, Ill., was a four-star recruit and the No. 136 player in the nation in Rivals.com's 2014 class.
Rivals also listed Thorson as the sixth-best dual-threat signal caller and seventh-best overall player from Illinois during his senior year at Wheaton North High School.
- Kayla Lombardo