Biology / Unit 4 Bio 0881 short lesson, about 20 seconds
The G2 Checkpoint
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The idea
The G2 checkpoint bars entry into the mitotic phase unless chromosome replication is complete and the DNA is undamaged.
In practice
A cell whose G2 checkpoint detects incomplete replication halts there and attempts to finish or repair the damage.
Where people slip
The G2 checkpoint's central concern is DNA integrity — size and reserves are checked too, but damage detection mainly gates this.
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