Question

The duplication of chromosomes or DNA occurs during

• A. Interphase.
• B. Prophase.
• C. Mitosis.
• D. Cytokinesis.

Answer 1

The correct option is A

Interphase.

The correct option is A.

Explanation of the correct option

1. The cell cycle is divided into 3 phases G1, S, G2 and M
2. The G1, S and G2 constitute the Interphase
3. G1 and G2 are the growth phase
4. S phase is known as synthesis phase during which the cell duplicates the DNA in its genome.

Explanation of the incorrect options

Option B:

1. Major changes during Mitosis are the disappearance of nuclear membrane and the beginning of the thickening of chromosomes.

Option C:

1. Mitosis is a type of cell division that occurs in somatic cells.
2. The daughter cells possess the same number of chromosomes as the parent cell.

Option D:

1. Cytokinesis is the division of the cytoplasm into two equal halves.

Final answer:

The duplication of chromosomes or DNA occurs during Interphase.