Small disc-shaped structures at the surface of the centromeres serve as the sites of attachment of spindle fibres to the chromosomes during metaphase. These structures are called

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During metaphase, spindle fibres attach to the chromosomes. The specific sites of attachment are small disc-shaped structures present at the surface of the centromeres, which are known as kinetochores. The centromere is the primary constriction of the chromosome, but the actual attachment points for the spindle microtubules are the kinetochores. Centrosomes and centrioles are organelles that organise the spindle fibres at the poles of the cell, not the structures on the chromosomes where the fibres attach. Answer: