During cell division,sometimes there will be failure of separation of sister chromatids. This event is called

$A$ single cell containing a large number of nuclei is called:

$A$: In telophase,the two daughter nuclei formed at opposite poles contain the same number of chromosomes as the parent nucleus.
$R$: In anaphase,the centromere of each chromosome splits,allowing the sister chromatids to separate.

The following events occur during the various phases of the cell cycle. Name the phase against each of the events.
$(a)$ Disintegration of nuclear membrane .........
$(b)$ Appearance of nucleolus
$(c)$ Division of centromere
$(d)$ Replication of $DNA$

Select the correct option $:-$

Column $-I$	Column $-II$
$(a)$ Synapsis aligns homologous chromosomes	$(i)$ Anaphase$-I$
$(b)$ Synthesis of tubulin protein	$(ii)$ Zygotene
$(c)$ Action of enzyme recombinase	$(iii)$ $G_2$-phase
$(d)$ Centromeres split and chromatids move towards opposite poles	$(iv)$ Anaphase$-II$
	$(v)$ Pachytene

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.