Here's why:

* DNA Replication: Before mitosis begins, the cell's DNA replicates. This means the entire genome (all the genetic material) is copied.

* Chromosomes: The duplicated DNA is organized into chromosomes, which are like tightly wound bundles of DNA. Each chromosome has a copy of the original DNA.

* Equal Distribution: During mitosis, the replicated chromosomes are carefully separated and distributed equally to the two new daughter cells.

This ensures that each daughter cell receives a complete and identical copy of the parent cell's genetic information.