The M phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, cells would most likely be arrested in ________. A) telophase B) prophase C) G₂ D) metaphase

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The M phase checkpoint ensures all chromosomes are attached to the mitotic spindle before proceeding into anaphase. If this checkpoint fails, the cell would most likely be arrested in metaphase, where chromosomes are aligned at the equator but have not yet separated. Arresting the cell at this checkpoint prevents unequal distribution of genetic material to daughter cells.

The M Phase Checkpoint Ensures That All Chromosomes Are Attached