The major event that occurs during the $Anaphase$ of mitosis,which brings about the equal distribution of chromosomes is

The longest phase of mitosis is .........

The complete disintegration of the nuclear envelope in a cell cycle marks the

The morphology of the chromosomes is studied during

Which of the following events is not associated with telophase?

Select the correct statement regarding $S-$phase of interphase.
$I.$ Occurs between $G_1$ and $G_2$ phase.
$II.$ $DNA$ replication begins in the nucleus.
$III.$ Centrioles duplicate in the cytoplasm.
$IV.$ As $DNA$ is doubled,the number of chromosomes also doubles.