Biology – Replication and division of nuclei and cells | e-Consult

The student's statement is incorrect. While the centromere is involved in the attachment of sister chromatids, its function is far more complex than simply being a point of attachment between them.

The centromere is a constricted region of the chromosome that plays a critical role in chromosome segregation during mitosis and meiosis. Its primary function is to provide the attachment point for spindle fibres. Each sister chromatid has its own centromere. During metaphase of mitosis and meiosis, the chromosomes align at the metaphase plate, and the spindle fibres from opposite poles attach to the centromeres of each chromosome.

These spindle fibres exert tension on the centromeres, pulling the sister chromatids apart and towards opposite poles of the cell. This ensures that each daughter cell receives a complete and identical set of chromosomes. The precise organization of the centromere and its interaction with the spindle fibres are essential for accurate chromosome segregation. Failure of this process can lead to aneuploidy (an abnormal number of chromosomes), which can have severe consequences for the cell and organism. Therefore, the centromere is not just a point of attachment between sister chromatids; it is a crucial structural component that ensures accurate chromosome segregation.