In which stage does crossing over occur?

In which of the following does meiosis occur?

Chromosomes start pairing up,which is called $.....P.....$,and this occurs during the $.....Q....$ stage.

What will be the amount of $DNA$ in meiosis $II$ products if a meiocyte contains $30 \; pg$ $DNA$ in the $G_1$ phase (in $; pg$)?

$S$ - Statement: Meiosis occurs during the formation of reproductive cells. $R$ - Reason: During meiosis,the genetic material replicates twice,and the cell divides twice.

The enzyme recombinase is required at which stage of meiosis?