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Cell Cycle

In the S phas...

Question

In the S phase of the cell cycle

A

Amount of DNA doubles in each cell

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B

Amount of DNA remains the same in each cell

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C

Chromosome number is increased

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D

Amount of DNA is reduced to half in each cell.

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Solution

The correct option is A
Amount of DNA doubles in each cell

In S phase of the cell cycle, DNA replicates, thereby, doubling their content, i.e., 1C to 2C for haploid cells and 2C to 4C for diploid cells (where "C" stands for "content"). However, the number of chromosomes does not increase.

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Q. The DNA content of individual cells and the number of cells in each phase of a "cell cycle" can be determined using flow cytometry. Which of the following combinations of "phase of a cell cycle and its corresponding DNA content" can be considered normal?
(i) Diploid cells found in the

G_{0}

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(ii) Cells with twice the normal DNA content in the early M phase.
(iii) Cells with intermediate amounts of DNA in the S phase.
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Q. Select the correct option:The DNA content of individual cells and the number of cells in each phase of a " cell cycle" can be determined using flow cytometry. Which of the following combinations of "phase of a cell cycle and its corresponding DNA content" can be considered normal?
(i) Diploid cells found in the

G_{0}

G_{1}

phase.
(ii) Cells with twice the normal DNA content in the early M phase.
(iii) Cells with intermediate amounts of DNA in the S phase.
(iv) Cells with twice the normal DNA content in the

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Q. A cell has 4 picogram of DNA of G1 phase. What will be the amount of DNA in a cell in quiescent phase?

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What is the amount of DNA in the same cell in anaphase I of meiosis?

S

phase of interphase , amount of

D N A

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