Crossing over is also an enzyme-mediated process,and the enzyme involved is called:

The dissolution of the synaptonemal complex occurs during which phase of meiosis?

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

The process by which the chromosomes are separated in the sex cells and their number reduced from the diploid to haploid condition is known as

The diagram shows a bivalent at prophase-$I$ of meiosis. Which of the four chromatids can cross over?

If there are $30$ chromosomes in $G_1$ phase,then what will be the number of bivalents in the zygotene stage?