Mitosis occurs in multicellular organisms during various stages of growth and development. Primarily, it is observed during embryonic development, tissue growth, and wound healing. The process takes place in somatic cells, which are all the body cells except for gametes (sperm and eggs).
The main reasons for mitosis are to enable growth and repair. As a multicellular organism grows, cells divide to increase the number of cells, allowing the organism to develop. Additionally, when tissues are damaged, mitosis helps to replace dead or injured cells to maintain the integrity and functionality of the tissue.
In conclusion, mitosis is a vital process that supports the development, maintenance, and repair of multicellular organisms. It ensures that cells divide accurately, preserving genetic information and enabling the organism to thrive.