Question

which of the following phases does not have a checkpoint? select the correct answer.
the g₁ phase
the s phase
the g₂ phase
the mitotic phase

Explanation:

Cell cycle checkpoints ensure proper progression: G₁ has a checkpoint (restriction point) to enter S phase; G₂ checks DNA integrity before mitosis; mitotic phase has a spindle checkpoint. S phase (DNA synthesis) lacks a dedicated checkpoint.

Answer:

The S Phase