When a cell divides by mitosis the new cells are genetically identical. What causes the cells to be genetically identical?

Mitosis causes the cells to be genetically identical. Since, the cell makes copies of its chromosomes. the cell separates the copied chromosomes to form to new sets. this causes them to be genetically identical.

Mitosis. Mitosis is used to produce daughter cells that are genetically identical to the parent cells. The cell copies - or 'replicates' - its chromosomes, and then splits the copied chromosomes equally to make sure that each daughter cell has a full set.