DNA replication takes place in S-phase.

There is no change in DNA content of cell in G1 phase.

Cell cycle continues in mitosis.

Proteins required for formation of spindle are formed in G2 phase by centrioles.

10% of the time is spent in M-phase.

Fleming used the term mitosis for the first time for somatic cell division (1882).

In animal cells, the astral rays emerge out from centrosomes and give centrioles star-like appearance.

The nucleoli and nuclear membrane disappear in prophase of mitosis.

Chromosomes can be identified and counted because each chromosome becomes more compact and short.

Chromosomes start becoming visible under light microscope in prophase.

Metaphase stage is the most suitable phase for counting and identifying chromosomes.

The duration of cell cycle in  humans is 26 hours.

In anaphase, centromeres of each chromosome divide and permit the separation of two chromatids.

During telophase, nuclear membrane reappears, chromatin network is formed and spindle fibres disappear.

Spindle fibres are composed of proteins, called microtubules.