 During its lifetime , a nucleus may be broken down or destroyed , either in the process of cell division or as a consequence of apoptosis ( the process of programmed cell death ) . During these events , the structural components of the nucleus — the envelope and lamina — can be systematically degraded . In most cells , the disassembly of the nuclear envelope marks the end of the prophase of mitosis . However , this disassembly of the nucleus is not a universal feature of mitosis and does not occur in all cells . Some unicellular eukaryotes ( e.g. , yeasts ) undergo so @-@ called closed mitosis , in which the nuclear envelope remains intact . In closed mitosis , the daughter chromosomes migrate to opposite poles of the nucleus , which then divides in two . The cells of higher eukaryotes , however , usually undergo open mitosis , which is characterized by breakdown of the nuclear envelope . The daughter chromosomes then migrate to opposite poles of the mitotic spindle , and new nuclei reassemble around them . 
 During its lifetime , a nucleus may be broken down or destroyed , either in the process of cell division or as a consequence of apoptosis ( the process of programmed cell death ) . During these events , the structural components of the nucleus — the envelope and lamina — can be systematically degraded . In most cells , the disassembly of the nuclear envelope <a href='uninflect' title='1'><mark>marks</mark></a> the end of the prophase of mitosis . However , this disassembly of the nucleus <a href='negative_concord' title='2'><mark>is</mark></a> <a href='negative_concord' title='3'><mark>not</mark></a>a universal feature of mitosis and <a href='uninflect' title='4'><mark>does</mark></a> not occur in <a href='None' title='5'><mark>all</mark></a><a href='negative_concord' title='6'><mark>cells</mark></a> . Some unicellular eukaryotes ( e.g. , yeasts ) undergo so @-@ called closed mitosis , in which the nuclear envelope <a href='uninflect' title='7'><mark>remains</mark></a> intact . In closed mitosis , the daughter chromosomes migrate to opposite poles of the nucleus , which then <a href='uninflect' title='8'><mark>divides</mark></a> in two . The cells of higher eukaryotes , however , usually undergo open mitosis , which is characterized by breakdown of the nuclear envelope . The daughter chromosomes then migrate to opposite poles of the mitotic spindle , and new nuclei reassemble around them . 
Durin its lifetime , a nucleus may b broken down or destroyed , either in da process of cell division or as a consequence of apoptosis ( the process of programmed cell death ) . During these events , the structural components of tdanucleus — the envelope and lamina — can bbsystematically degraded . In most cells , thdaisassembly of the nuclear envelope mark thedad of the prophase of mitosis . However , this disassembly of the nucleus ain't a universal feature of mitosis and do not occur in no cells . Some unicellular eukaryotes ( e.g. , yeasts ) undergo soo @-@ called closed mitosis , in which the nuclear envelope remain intact . In closed mitosis , the daughter chromosomes migrate to opposite poles of the daleus , which then divide in 2 . The cells of higher eukaryotes , however , usually undergo open mitosis , which is characterized by breakdown of the nuclear envelope . The daughter chromosomes then migrate to opposite poles of the mitotic spindle , and new nuclei reassemble around them .