Question

Assertion (A): DNA synthesis occurs in G₁ and G₂ periods of cell cycle.

Reason (R): During G₁ and G₂ phase, the DNA content become double.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is false but R is true.

Explanation:

DNA synthesis does not occur during the G₁ and G₂ phases; it occurs only during the S (Synthesis) phase of the cell cycle. During the cell cycle, the DNA content doubles by the end of the S phase, and this doubled DNA content is maintained during the G₂ phase until cell division. Hence, the Assertion is false, while the Reason is considered true in the context that the cell entering G₂ has doubled DNA content.