During interphase,$RNA$ and proteins are synthesized in

Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities occur during mitosis?
$(a)$ Nuclear membrane fails to disintegrate
$(b)$ Duplication of $DNA$ does not occur
$(c)$ Centromeres do not divide
$(d)$ Cytokinesis does not occur

Match the following.

Column-$I$	Column-$II$
$i$. $G_1$ phase	$P$. Production of proteins and microtubules
$ii$. $S$ phase	$Q$. Karyokinesis and cytokinesis
$iii$. $G_2$ phase	$R$. $1^{st}$ phase of interphase
$iv$. $M$ phase	$S$. Synthesis of $DNA$

Identify the correct statements:
$(i)$ Synapsis occurs between homologous chromosomes during Prophase-$I$ of meiosis.
$(ii)$ Centromere division occurs during Anaphase-$II$ of meiosis.
$(iii)$ Spindle fibers completely disappear during Telophase of mitosis.
$(iv)$ The nucleus reappears at the Telophase-$I$ stage of meiosis.

In which type of cell division are chromosomes not clearly visible?

Which microscope is most suitable for studying the active stages of cell division?