During which phase do chromosomes line up single file at the equatorial plate?

During which phase do chromosomes line up single file at the equatorial plate?

• A. Metaphase
• B. Prophase
• C. Anaphase
• D. Telophase

Answer: (A)

Metaphase is the stage when chromosomes line up along the cell’s equatorial plane in a single, orderly row. The spindle apparatus is fully formed and microtubules attach to kinetochores at the centromeres, pulling sister chromatids toward opposite poles. This precise alignment ensures that when the chromatids separate in the next phase, each daughter cell will receive one copy of each chromosome. In other stages, chromosomes condense and the nuclear envelope breaks down (prophase), chromatids separate and move to opposite poles (anaphase), or chromosomes arrive at the poles and the cell begins to divide and reorganize (telophase). So the described “single file at the equator” situation happens during metaphase.

Metaphase is the stage when chromosomes line up along the cell’s equatorial plane in a single, orderly row. The spindle apparatus is fully formed and microtubules attach to kinetochores at the centromeres, pulling sister chromatids toward opposite poles. This precise alignment ensures that when the chromatids separate in the next phase, each daughter cell will receive one copy of each chromosome. In other stages, chromosomes condense and the nuclear envelope breaks down (prophase), chromatids separate and move to opposite poles (anaphase), or chromosomes arrive at the poles and the cell begins to divide and reorganize (telophase). So the described “single file at the equator” situation happens during metaphase.