$X$-bodies were discovered by:

Which chromosome may be lost during cell division?

Select the matched ones.
$I.$ $S$-phase - $DNA$ replication
$II.$ Zygotene - Synapsis
$III.$ Diplotene - Crossing over
$IV.$ Meiosis - Shown by haploid and diploid cells
$V.$ $G_{2}$-phase - Quiescent stage

$A$: $DNA$ replication occurs only once in meiosis.
$R$: Exchange of $DNA$ in chromosomes is seen in mitosis.

Statement $P$: The $G_1$ phase is the final phase of interphase.
Statement $Q$: $DNA$ synthesis occurs in the $G_2$ phase.

Arrange the following events of mitosis in correct order and select the correct option from options given below :
$a.$ Movements of chromosome towards opposite pole
$b.$ Movement of centriole towards opposite poles
$c.$ Chromosome align on equator
$d.$ Reformation of nuclear membrane and nucleolus