Why is mitosis important for multicellular organisms?

Mitosis is essential for multicellular organisms primarily because it is the process through which they can grow and repair tissues. During mitosis, a single cell divides to produce two genetically identical daughter cells, both of which retain the same diploid number of chromosomes as the original cell. This process ensures that as organisms grow, their cells can proliferate to increase tissue mass and facilitate repair in case of injury.

As an organism develops, mitosis enables the formation of new cells that are needed for growth and development. Additionally, if tissues are damaged, mitosis is crucial for regenerating cells to replace those lost or injured, maintaining the functionality and health of the organism.

The emphasis on producing identical diploid cells is significant since this characteristic is necessary for maintaining the genetic continuity and stability of somatic (body) cells.