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Interphase

DNA/chromosom...

Question

DNA/chromosome replication/chromatid formation takes place during

A

G_{1} - p h a s e

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B

G_{2} - p h a s e

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C

S - p h a s e

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D

Prophase

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Solution

The correct option is C $S - p h a s e$
Interphase is characterized is by three phases $G_1$ phase, S phase, and $G_2$
phase. It is the synthesis phase, during which DNA in each chromosome replicates producing the second chromatid. The two chromatids are known as sister chromatids. DNA replication occurs in the S- phase.
So, the correct option is 'C'.

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The replication of DNA takes place during which phase

(I) Mitosis
(II) G

_{1}

phase
(III) S phase

Q. Assertion :Synthesis of DNA takes place in the S phase of interphase. Reason: Every chromosome, during metaphase, has two chromatids.

Q. In which of the following phase DNA / chromosome replication takes place?

Q. Which one is CORRECT about s-phase (synthetic phase)?
I. It occurs between

G_{1}

G_{2}

II. It marks the period during which DNA replicates
III. At the end of this phase DNA is doubled but the number of chromosomes remains unchanged
IV As the DNA is doubled in this phase number of chromosomes is also doubled
V. Centrioles replicate in this phase

Q. Which one is CORRECT about s-phase (synthetic phase)?
I. It occurs between

G_{1}

G_{2}

II. It marks the period during which DNA replicates
III. At the end of this phase DNA is doubled but the number of chromosomes remains unchanged.
IV. As the DNA is doubled in this phase number of chromosomes is also doubled .
V. Centrioles replicate in this phase.

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