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

Match the following columns correctly:

Column $I$	Column $II$
$(a)$ $G_1$ phase	$(p)$ Synthesis of new $DNA$ occurs
$(b)$ $G_2$ phase	$(q)$ No $DNA$ synthesis occurs
$(c)$ $S$ phase	$(r)$ $DNA$ synthesis stops
$(d)$ Prophase	$(s)$ Formation of mitotic spindle occurs

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

$(1)$ Definition / Explanation: Mitosis
$(2)$ Definition / Explanation: Meiosis

Match the following columns and select the correct option:

Column-$I$	Column-$II$
$(1)$ Attachment of spindle fibers to kinetochores	$(a)$ Prophase
$(2)$ Formation of contractile ring in cytoplasm	$(b)$ Telophase
$(3)$ Decondensation of chromosomes	$(c)$ Cytokinesis
$(4)$ Condensation of chromosomal material	$(d)$ Metaphase

Which of the following statements are correct?
$a -$ Cell cycle duration can vary from organism to organism and also from cell type to cell type.
$b -$ $DNA$ synthesis occurs only in pachytene.
$c - G_1$ phase corresponds to the interval between mitosis and initiation of $DNA$ replication.