Which stage of meiosis involves the separation of the centromere?

During the first meiotic division, the exchange of genetic material between the chromatids of homologous chromosomes occurs. What is this process called?

Choose the correct statements from the following:
$(I)$ Diakinesis is the middle phase of prophase-$I$.
$(II)$ Diakinesis is marked by the terminalization of chiasmata.
$(III)$ Meiotic spindle is not formed during diakinesis.
$(IV)$ By the end of diakinesis,the nucleolus disappears.

Which tissue of animals and plants exhibits meiosis?

After $Meiosis-I$,the two sister chromatids of a chromosome are:

In higher organisms,crossing over that results in genetic recombination occurs between .......