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At metaphase, chromosomes are attached to the spindle fibres by their:

1. satellites
2. secondary constrictions
3. kinetochores
4. centromere

Correct answer: kinetochores

Solution

Spindle fibres attach to chromosomes through kinetochores, which are protein complexes assembled on the centromere. They provide the physical connection needed to align chromosomes at the metaphase plate and later separate sister chromatids.

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