The synaptonemal complex first appears in .........

In oocytes of some vertebrates,this stage can last for months or years.

Match the following stages of meiosis with their characteristic events:
$(a)$ Zygotene $(i)$ Terminalization
$(b)$ Pachytene $(ii)$ Chiasmata
$(c)$ Diplotene $(iii)$ Crossing over
$(d)$ Diakinesis $(iv)$ Synapsis
Select the correct option from the following:

The number of chiasmata depends on what?

During the first metaphase of meiosis,the centromeres:

Meiosis occurs in -