Question

1. Which of the following occur during prophase?

   		Nuclear envelope breaks down
   		Microtubules form the mitotic spindle apparatus
   		Chromosomes condense
   		All of the above
   		None of the above

Answer 1

Mitosis is the stage of cell division where one cell divides into two daughter cells having the same ploidy of the previous cell.

The cell cycle consists of 4 steps G1, S, G2 M. The stages G1, S, G2 combined called interphase and the M phase is called Mitotic phase

Mitosis has four stages

PROPHASE

METAPHASE

ANAPHASE

TELOPHASE

In the Prophase stage of cell division, the condensation of chromosome starts where Chromosomes look like thread due to the breaking of the cell structure and become condense in this stage.

At the end of Prophase nuclear envelope starts disappearing which becomes reappear at the starting of the telophase stage of mitosis.

In Prophase stage microtubule formation occur where spindle fiber is attached to microtubules whose job is to maintain the movement of chromosomes across the cell.

Hence all the given options are correct.

All of the above options are correct.