The enzyme $Recombinase$ is required at which stage of $Meiosis \ I$?

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:

Which of the following stages of meiosis is responsible for deciding the genetic constitution of gametes?

Assertion : Diplotene is characterized by the presence of chiasmata.
Reason : Diplotene can last for months and years in oocytes of some vertebrates.

In which of the following stages are the chromosomes seen as unclear or thread-like?

Which process occurs at the end of diakinesis?