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At metaphase, chromosomes are attached to the spindle fibres by their
A
Kinetochores
B
Centromere
C
Satellites
D
Secondary constrictions
Detailed Solution
Each metaphase chromosome consists of two sister chromatids held together at the centromere (primary constriction).
On the sides of the centromere there are small disc-shaped structures called kinetochores.
The kinetochores serve as the sites of attachment of the spindle fibres to the chromosomes, which then move to the equator of the cell.
The centromere only holds the chromatids together; satellites and secondary constrictions have no role in spindle attachment.
Hence chromosomes are attached to the spindle fibres by their kinetochores.
On the sides of the centromere there are small disc-shaped structures called kinetochores.
The kinetochores serve as the sites of attachment of the spindle fibres to the chromosomes, which then move to the equator of the cell.
The centromere only holds the chromatids together; satellites and secondary constrictions have no role in spindle attachment.
Hence chromosomes are attached to the spindle fibres by their kinetochores.