Question

In which phase of the cell cycle does replication of DNA take place?

• A. G1 phase
• B. M phase
• C. S phase
• D. G2 phase

Answer 1

The Correct Option is C

DNA replication occurs during the S (Synthesis) phase of the cell cycle. During this phase, each chromosome is replicated to form two sister chromatids, which will be separated during mitosis. The S phase ensures that each daughter cell receives an exact copy of the DNA.

Answer 2

DNA replication occurs during the S phase (Synthesis phase) of the cell cycle. This phase is responsible for the synthesis of DNA, where the entire genome is replicated to ensure that each daughter cell receives a complete set of genetic material.

• G1 phase: The cell grows and carries out normal metabolic functions but does not replicate its DNA.
• M phase: This is the mitotic phase, where the cell undergoes mitosis and divides into two daughter cells, but DNA replication does not occur here.
• S phase: This is where DNA replication occurs. Each chromosome is duplicated, forming two sister chromatids.