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Cytokinesis

Edexcel AS-level BiologyThe Cell CycleLesson 9 of 18

Cytokinesis is the division of the cytoplasm to form two separate daughter cells. It follows nuclear division (mitosis) and usually begins during late telophase. Mitosis divides the nucleus; cytokinesis divides the rest of the cell.

In animal cells, a ring of protein filaments (actin and myosin) just beneath the cell surface membrane contracts around the equator of the cell. This pulls the membrane inwards to form a cleavage furrow, which deepens until the membrane pinches apart, giving two cells.

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Key terms in this lesson

middle lamella
A layer rich in calcium pectate between the cell walls of neighbouring plant cells, which glues them together.

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