In prophase 1 of meiosis, crossing over results in

In prophase 1 of meiosis, crossing over results in:

1) Chromosomes are visible as a bivalent ( tetrad) tightly grouping of two chromosomes, each consisting of two sister chromatids

2) The nuclear envelope disappear.

3)  Two chromosomes are grouped together very tightly.

4) chiasmata formation take place.

enzyme speed up the reactions

not sure if this what   you'r looking for would be percent composition