Amitosis

Amitosis
Definition
A cell division without spindle formation is called Amitosis.
Mechanism of Amitosis
Amitosis is also called the direct cell divisions. In this cell division first the nucleus of the cell become dumbbell shaped and finally it splits into two nuclei. In this way karyokinesis is completed.
Then an invagination appears in the centre of the cell which becomes deep and at the end it divides the parent cell completely into the two daughter cells.
Nuclear Budding
When nuclear portion unequally divide is called nuclear budding.
Nuclear Fragmentation
When nuclear portion divides more than two in number is called nuclear fragmentation.
Example
This type of cell division usually occurs in bacteria, protozoa, abnormal and diseased tissues such as cancer and tumor.