$A :$ $G_2$-phase is the pre-mitotic phase.
$R :$ Chromosomes undergo condensation in this phase.

  • A
    Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
  • B
    Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.
  • C
    Assertion is correct,but Reason is incorrect.
  • D
    Both Assertion and Reason are incorrect.

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Among eukaryotes,replication of $DNA$ takes place in:

What is the average cell cycle span for a mammalian cell?

The period between mitosis and the initiation of $DNA$ replication is called .........

Select the correct statements regarding $S$-phase of interphase:
$I.$ Occurs between $G_{1}$ and $G_{2}$ phases.
$II.$ $DNA$ replication begins in the nucleus.
$III.$ Centrioles duplicate in the cytoplasm.
$IV.$ As $DNA$ is doubled,the number of chromosomes also doubles.
The option with correct statements is:

Two key events take place during $S$ phase in animal cells: $DNA$ replication and duplication of centriole. In which parts of the cell do these events occur?

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