What happens during mitosis?

Which stain is commonly used for the study of cell division?

Analogy type questions:
$(1)$ $S$-phase : $DNA$ synthesis :: $G_0$ phase : ...........
$(2)$ Cleavage furrow in animal cells : Periphery to center :: In plant cells : ................

Polytene chromosomes in salivary glands of Drosophila are formed as a result of

Identify the correct statements.
$(i)$ Somatic cells undergo mitosis,and germ cells undergo meiosis.
$(ii)$ During mitosis,$DNA$ replicates once for one cell division,and in meiosis,$DNA$ replicates twice for two cell divisions.
$(iii)$ Meiosis and mitosis are observed in organisms that reproduce both sexually and asexually.

Karyokinesis $= P$
Cytokinesis $= Q$
Select the correct option for $P$ and $Q$.
$P$ and $Q$ are respectively: