NEETBotanyCell Cycle and Cell Division
What are the spindle fibres?
Options
- AMicrotubules that attach to the chromosomes during mitosis
- BThe structures that hold the chromatids together
- CThe structures that align the chromosomes along the metaphase plate
- DThe structures that initiate the condensation of chromosomal material
Correct answer
A. Microtubules that attach to the chromosomes during mitosis
Step-by-step solution
Small disc-shaped structures at the surface of the centromeres are called kinetochores. These structures serve as the sites of attachment of spindle fibres (formed by the spindle fibres) to the chromosomes that are moved into position at the centre of the cell. hence, the metaphase is characterised by all the chromosomes coming to lie at the equator with one chromatid of each chromosome connected by its kinetochore to spindle fibres from one pole and its sister chromatid connected by its kinetochore to spindle fibr