Telophase

This is the final stage of mitosis  in which the mitotic  spindle  disappears  and  each polar  chromosomal group is reconstituted  into a daughter  nucleus,  A   nucleus  membrane  develops  around  each chromosomal  group  from  endoplasmic  reticulum. Soon , the  cell itself divides into  two  daughter  cells, The  chromosomes start  thinning   and  lengthening  by  decondensation  () unlooping  , uncoiling , and unfolding , ),  ultimately  becoming  10 nm chromatin  fibres  and forming  the chromatin  reticulum,  their  heterochromatic  regions  , however  remain  folded in 30  nm  thick  solenoids . Nucleoli  also form  around  the nucleolar  organizer sites  of specific  chromatin fibres.