Answer:
12 chromosomes in each cell.
Step-by-step explanation:
Mitosis is a form of cellular division that produces two identical daughter cells, each having the same number of chromosomes as the parent cell.
This happens because a cell replicates it's chromosomes before dividing (this occurs in interphase), creating two sister chromatids. These chromatids then get separated in anaphase, producing two daughter cells, each with the same number of chromosomes as the parent cell.
I've attached an image which should hopefully explain how this happens. :)