BiologyCell Biology

Cell Division: Which Stage Is Blocked by an Uncleared M Checkpoint?

Learn why an uncleared M checkpoint blocks anaphase in cell division. Compare all four options and distinguish the arrest stage from the blocked transition.

Question

If the M checkpoint is not cleared, what stage of mitosis will be blocked?

A. prophase B. prometaphase C. metaphase D. anaphase

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Evidence boundary

This answer addresses the single multiple-choice item in the cited OpenStax-authored LibreTexts section, with its four options in the original order. It assumes a functioning M checkpoint that has not been satisfied. No microscopy result, experimental duration, or defective-checkpoint phenotype is supplied or inferred.