The process of appearance of recombination nodules occurs at which sub-stage of prophase $I$ in meiosis?

Dissolution of the synaptonemal complex occurs during

In pachytene,each tetrad contains

$A$: Synaptonemal complex develops between two synapsed homologous chromosomes.
$R$: Mitosis cannot be completed without the synaptonemal complex.

At which site does crossing over occur between the chromatids of homologous chromosomes?

What is the pairing of homologous chromosomes during the zygotene stage called?