Bivalents in meiosis are

In meiosis,the daughter cells are not similar to that of parent because of

In which stage of meiosis is the enzyme recombinase required?

Match the stages of prophase $I$ given in Column-$I$ with their features in Column-$II$ and choose the correct options from the choices given below:

Column $I$	Column $II$
$A$. Leptotene	$i$. Chromosomes visible under light microscope
$B$. Zygotene	$ii$. Chromosomes start pairing together
$C$. Pachytene	$iii$. Exchange of genetic materials between non-sister chromatids of the homologous chromosomes.
$D$. Diplotene	$iv$. Dissolution of synaptonemal complex
$E$. Diakinesis	$v$. Terminalisation of chiasmata

At the end of which stage does the nucleolus disappear?

In which phase of meiosis does the number of chromosomes become halved?