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Question

In S phase of the cell cycle:

A
Amount of DNA doubles in each cell
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B
Amount of DNA remains 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 the DNA content doubles, i.e., 1C to 2C for haploid cells and 2C to 4C (where "C" stands for "content"). Lately, however, this has not been a very commonly used representation of DNA content) for diploid cells. However, the number of chromosomes does not increase.

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