Spindle fibre attach onto :

Kinetochore of the chromosome.

The correct answer is Option (2)-Kinetochore of the chromosome.

Spindle fibers attach onto the kinetochore of the chromosome during cell division.

The kinetochore is a protein structure located at the centromere region of the chromosome. It serves as the attachment point for spindle fibers (also known as microtubules) during both mitosis and meiosis. The spindle fibers attach to the kinetochore to facilitate the movement and segregation of chromosomes into daughter cells during cell division.