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Stages of Mitosis
Interphase
u When
the cell is not dividing
u Cell grows to about twice its size
u Produces various organelles
u Preparation for division
u DNA is duplicated
Prophase
u Chromosomes
in the nucleus
condense
u Each chromosome consists of two
chromatids held together by a
centromere
u Nuclear membrane break down
Metaphase
u Chromosomes
line up in the middle of the
cell
u Centromeres of the chromosome are the
same distance from each side of the cell
u Microtubules attach to centromeres
uCentrosomes
control microtubules
Anaphase
u Chromatids
separate
u Chromatids pulled to opposite sides
of the cell
u Each side of the cell ends up with a
complete set of chromosomes
Telophase
uA
new nuclear membrane forms
around each group of chromosomes
u The new cell has two identical nuclei
u Chromosomes become less
condensed
u Cytokinesis begins
Cytokinesis
u Division
of the parent cell’s
cytoplasm
u Cell membrane pinches inward
between the new nuclei
u Forms two complete cells