NEET BIOLOGY

Detailed explanation-1: -Cytokinesis begins in anaphase and ends in telophase, reaching completion as the next interphase begins. The first visible change of cytokinesis in an animal cell is the sudden appearance of a pucker, or cleavage furrow, on the cell surface.

Detailed explanation-2: -The position of the cleavage furrow is induced by the mitotic spindle during early anaphase.

Detailed explanation-3: -Cytokinesis takes place in four stages: initiation, contraction, membrane insertion and completion. The events occurring within these stages differ in animal and plant cells.

Detailed explanation-4: -During cellular cleavage, the contractile ring tightens around the cytoplasm of the cell until the cytoplasm is pinched into two daughter cells. During the final phase of mitosis, telophase, the furrow forms an intercellular bridge using mitotic spindle fibers.

Detailed explanation-5: -Thus, cleavage begins soon after fertilization and ends shortly after the stage when the embryo achieves a new balance between nucleus and cytoplasm.