AP BIOLOGY

Detailed explanation-1: -Cytokinesis occurs in the last step of cell division when the ingressive cleavage furrow begins the partition of the cytoplasm between the daughter cells.

Detailed explanation-2: -The first visible change of cytokinesis in an animal cell is the sudden appearance of a pucker, or cleavage furrow, on the cell surface. The furrow rapidly deepens and spreads around the cell until it completely divides the cell in two.

Detailed explanation-3: -To complete the cell cycle, the cleavage furrow draws the plasma membrane toward the cell center, pinching the cytoplasm into two lobes that are subsequently separated into two cells.

Detailed explanation-4: -Cytokinesis takes place in four stages: initiation, contraction, membrane insertion and completion. The events occurring within these stages differ in animal and plant cells.