2n -----> 2 x 2n

Replicative, simple cell division
 

Interphase                                 2n

Prophase                                  DNA synthesis, nuclear envelope
                                                     breakdown, centrioles replicate and move to poles,
                                                     beginning of spindle formation

Metaphase                                 4n     Alignment of all chromosomes on metaphase
                                                                plate

Anaphase

Telophase                                 Separation and cytokinesis
 
 

I                                         2n                     Replication Division
 

Interphase
                                DNA synthesis and crossing-over
Prophase
Metaphase
Anaphase
Telophase            2 x 2n

II                                                                 Reductive Division
 

Prophase
                                No DNA replication