noun
or cata·chro·ma·sis ˌkad.əˈkrōməsə̇s
( plural katachroma·ses or catachroma·ses -məˌsēz)
Etymology: New Latin, from kata- or cata- + chrom- + connective -a- + -sis
: the mitotic nuclear transformations leading to formation of daughter nuclei from the chromosome groups separated in anaphase — compare anachromasis