In which phase of mitosis do the chromatids of each chromosome separate from each other?

Anastral mitosis is found in

At the end of which phase do the nuclear envelope and nucleolus disappear?

The figure shows a stage of cell division. Identify the correct stage and its characteristic feature.

Which of the following phases are the longest and shortest in mitosis?

Read the following statements:
$(a)$ Complete disintegration of the nuclear envelope marks the start of the second phase of mitosis.
$(b)$ Metaphase chromosome is made up of one sister chromatid.