During metaphase,chromosomes that are attached to microtubules are observed to undergo a "back-and-forth" movement.What is happening during this movement?

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During metaphase, chromosomes are being aligned at the equator of the cell by the microtubules attached to them. The back-and-forth movement is due to tension created by opposing microtubules pulling the sister chromatids in opposite directions. This movement helps to ensure that each chromosome is correctly aligned before the onset of anaphase.

During Metaphase,chromosomes That Are Attached to Microtubules Are Observed to Undergo