Final answer:
During the first round of replication, misincorporated bases can be repaired in the S phase of the cell cycle. If the repair is not made during this phase, it becomes permanent in the second round of replication.
Step-by-step explanation:
The stage of the cell cycle where misincorporated bases can be repaired during the first round of replication is the S phase.
This is the phase of the cell cycle where DNA replication occurs, and it is responsible for copying the DNA to form an identical molecule of DNA.
If the repair of misincorporated bases is not made during the first round of replication, it becomes permanent during the second round of replication.