The small disc-shaped structures at the surface of the centromeres, which serve as the sites of attachment for spindle fibres during karyokinesis, are known as:

Step-by-step solution

Kinetochores are small disc-shaped structures present at the surface of the centromeres. They serve as the sites of attachment for spindle fibres to the chromosomes during cell division (karyokinesis). Centrioles are paired barrel-shaped organelles located in the cytoplasm of animal cells near the nuclear envelope, which play a role in organizing microtubules. Chiasmata are the points of contact between two non-sister chromatids belonging to homologous chromosomes, where crossing over occurs during meiosis. Telomer