School officials said Friday that Petty has been medically cleared for the No. 6 Bears when they play the ninth-ranked Wildcats. The winner is guaranteed at least a share of the Big 12 title, with Baylor the defending champion.
Petty was a full participant in practice Thursday, though he was still progressing through the concussion protocol.
After taking a high hit midway through the third quarter in last Saturday's 48-46 win over Texas Tech, Petty came out of that game with what the team called a "mild concussion."
Even when he was still having headaches Monday, Petty said then he expected to play in the home finale against the Wildcats.
Information from The Associated Press was used in this report.