Fig. 4. Mitosis. Only one pair of homologous chromosomes is shown. A. Each chromosome has replicated to form two identical chromatids joined at the centromere. The color difference indicates that one chromosome is paternally derived and one maternally derived. Chromosomes line up in tandem at the equatorial plate before cell division. B. Daughter-cell chromosomes, shown as chromatids, are identical to those of the parent cell.