The enzyme involved in crossing over is:

In which stage does the process of crossing over occur?

Match Column-$I$ with Column-$II$ and select the correct option.
Column-$I$ | Column-$II$
$(a)$ Pachytene | $(i)$ Synizesis
$(b)$ Zygotene | $(ii)$ Chiasmata
$(c)$ Diplotene | $(iii)$ Terminalization
$(d)$ Leptotene | $(iv)$ Crossing over
$(e)$ Diakinesis | $(v)$ Synapsis

$S -$ Statement: Recombination nodules are visible during the diplotene stage.
$R -$ Reason: Synapsis occurs during the zygotene stage.

Which phase of meiosis lasts for a very long duration?

Bivalent chromosomes align themselves at the equator during