Question

Arrange the following events in the order of occurrence in a mitotic cell division.

• A. 5→4→1→2→3
• B. 1→4→5→3→2
• C. 5→4→1→3→2
• D. 1→4→5→2→3

Answer 1

The correct option is B 1→4→5→3→2

$\bullet$ Mitotic cell division starts with the condensing of chromosome accompanied by splitting of the centrosome and its movement towards the opposite poles.
$\bullet$ As the nuclear envelope and nucleolus disappear, spindle fibres arise from the centrosomes and start binding to the condensed chromosomes at the centromeres.
$\bullet$ The chromosomes bound by the spindle fibers are then arranged in the middle of the cell forming the equatorial metaphase plate.
$\bullet$ Next the centromere splits and the sister chromatids are pulled away towards the poles by the contraction of spindle fibres.
$\bullet$ Following this, a cleavage furrow starts to develop in the middle of the cell while the nuclear membrane starts to reappear around the separated chromatids.
$\bullet$ The condensed chromatids start thinning into chromatin fibre along with reappearance of the nucleolus and the cleavage furrow deepening further.
$\bullet$ Finally as the nuclear membrane becomes fully intact, the cleavage furrow deepens and split the cells from middle into two daughter cells.