Cells that have undergone mitosis have how many chromosomes?
Cells that undergo mitosis retain their cell number, i.e., they remain diploid. All somatic cells divide by mitosis.
Only germ cells undergo another process called meiosis, in which they become haploid, or the number of chromosomes become halved after division. In this case, rather than saying the chromosomes become halved, each cell attains one set of chromosomes.