Four chromatids and two centromeres which are homologous occur in

$A$: Each chromosome of a bivalent attaches with two spindles in metaphase.
$R$: In metaphase,bivalents migrate towards the metaphasic plate.

Which of the following processes does not occur in mitosis?

The diplotene phase of meiosis is also characterised by:
$a$. Desynapsis
$b$. Complete terminalisation of chiasmata
$c$. Dictyotene stage
$d$. Complete disappearance of nuclear membrane and nucleoli
$e$. Complete development of astral rays and aster
$f$. Longest phase of prophase-$I$

What does Meiosis-$II$ represent?

During meiosis,the formation of bivalent chromosomes occurs in: