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CELL CYCLE (MITOSIS (1) Prophase (nuclear envelope disappears and spindle…
CELL CYCLE
MITOSIS
1) Prophase
nuclear envelope disappears and spindle fibres form
Chromatids condense
Chromosomes become visible when stained
2) Metaphase
the chromatids line up across the equator of the cell
The pairs of chromatids become attached to the spindle fibres by the centromeres
3) Anaphase
the spindle fibres contract to pull the chromatids by the centromeres to opposite poles
4) Telophase
each side of the cell contains one pair of the sister chromatids
nuclear envelope reforms
chromosomes uncoil and become long and thin
Interphase
cells spend most of their time in interphase (90%)
G1
Protein synthesis
first growth
organelles are made
G2
second growth
organelles grow
increasing energy stores
S
Syntheisis
DNA replication
Cytokinesis
cytoplasm divides
tow new cells are formed
the cells are genetically identical to the parent cell