Identify the event in meiosis mediated by the enzyme recombinase.

Given below are two statements:
Statement $I$: Chromosomes are fully condensed at the end of prophase $I$.
Statement $II$: Meiosis $I$ resembles mitosis.
In the light of the above statements, choose the most appropriate answer from the options given below:

At which stage of meiosis does the centromere divide?

In meiosis,the number of chromosomes is ..............

Crossing over takes place at a stage between

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