Question

in what phase do two nuclei begin to be seen and a cleavage begins?

Explanation:

Telophase is the final stage of mitosis. In this phase, the separated chromosomes reach the opposite poles of the cell. Nuclear envelopes start to form around each set of chromosomes, leading to the appearance of two nuclei. Also, in animal cells (as indicated by the cleavage furrow in the diagram), a cleavage furrow begins to form, which is the first sign of cytokinesis (the process of cell division). Anaphase is when chromosomes are pulled apart to opposite poles, but nuclear envelopes haven't formed yet. "Megaphase" and "gibbous phase" are not standard phases in mitosis.

Answer:

telophase