Question

In the 'S' phase of the cell cycle:

• A. Amount of DNA doubles in each cell.
• B. Amount of DNA is reduced to half in each cell.
• C. Chromosome number is increased.
• D. Amount of DNA remains the same in each cell.

Answer 1

The correct option is A

Amount of DNA doubles in each cell.

The correct option is A.

Explanation of the correct option

1. During the s phase the DNA starts to prepare itself for the cell division.
2. G1 or G2 takes part in the cell division the proteins get synthesized in the mitosis.
3. In the S phase, the number of chromosomes tends to remain the same during the process due to this the amount of DNA doubles.

Explanation of the incorrect options:

Option B:

1. Mitosis creates two different types of identical cells which are called daughter cells and each of the daughter cells contains a specific number of chromosomes.
2. These daughter cells are known as parent cell mitosis after that start to give rise to the more or unit daughter cells.
3. These unique daughter cell has half the number of chromosome as the parent cell.

Option C:

1. During the phase the chromosomes are increased or replicated during the G1 phase.
2. Each chromosome consists of a sister cell called chromatids.
3. The DNA amount of the cell effectively changes to double the chromosomes.

Option D:

1. During the phase of G1 or G2, the amount of DNA tends to remain the same.
2. Interphase itself starts to split into two and the G1 phase is the phase where the synthesis of the DNA takes place.

Final answer: In the S phase of the cell cycle amount of DNA doubles in each cell.