Types of cell division :
Three kinds of cell division are found in animal cells.
They are
- Amitosis or direct division,
- Mitosis or indirect division and
- Meiosis or reductional division.
Mitosis can be performed by haploid as well as diploid cells but meiosis can be performed by diploid cells only.
In honey bee, drones develop from haploid unfertilized eggs by mitosis.
In Marchantia, haploid spores form gametophyte by mitosis.
A. Amitosis :
It is the simplest mode of cell division. During amitosis, nucleus elongates and a constriction appears somewhere along its length.
This constriction deepens and divides the nucleus into two daughter nuclei.
This is followed by the division of the cytoplasm which results in the formation of two daughter cells.
This division occurs in unicellular organisms, abnormal cells, old cells and in foetal membrane cells.
