cell division in which the nucleus divides into nuclei containing the same number of chromosomes
First step of Mitosis. Centrioles move to opposite ends of the cell, and the nuclear membrane begins to dissolve.
Chromosomes are joined at centromeres, some microtubules join at centromeres; kinetochore microtubules align them in the center of the cell.
Chromosomes are attached by spindle fibers to centromeres at the cell's equator.
Centromeres break apart, the kinetochore microtubules shorten, pulling chromosomes to opposite ends of the cell.
Non-kinetochore microtubules pull two new cells apart. Nucleoli reform, nuclear envelope reappears. Chromosomes uncoil. Cleavage furrow forms in animal cells, Cell plate forms in plant cells.
G Zero Checkpoint
Cell has just gone through Mitosis, and is unlikely to continue it's cycle in the near future.
G One Checkpoint
Are all Organelles replicate?
G Two Checkpoint
Is cell large enough to divide?
Are all of the chromosomes doubled properly?
Are all chromosomes aligned?