Final answer:
When a cell with 45 chromosomes undergoes mitosis, each of the resulting daughter cells will have 45 chromosomes, identical to the original cell.
Step-by-step explanation:
If a cell starts off with 45 chromosomes and undergoes mitosis, each of the new daughter cells will also have 45 chromosomes at the end of the process. Mitosis is a type of cell division responsible for growth and repair in which a single cell divides to produce two new cells that are genetically identical to the original cell. This includes keeping the same number of chromosomes as the parent cell. In humans, typically cells have 46 chromosomes, 23 from each parent, but if a hypothetical cell has 45, this atypical chromosome number would be maintained through mitosis.