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1.each chromosome forms two chromotids; two centrioles begin to move to the poles of the cell and form a spindle.

2.the chromotids cross over and exchange DNA at two positions.

Ans.

Prophase represents the first stage of actual cell division (in both mitotic and meiotic cell division). It involves breakdown of nuclear envelope, nucleolus starts to disappear, and condensation of chromatin into chromosomes takes place.

The main purpose of prophase is to form chromosomes from chromatin, due to correct number of chromosomes can be divided equally to each daughter cell.

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