Among eukaryotes, replication of DNA takes place in:
Among eukaryotes, replication of DNA takes place in:
S phase
G1 phase
G2 phase
M Phase
The Correct Option is A
Solution and Explanation
In eukaryotic cells, the cell cycle consists of several distinct phases: G1 phase, S phase, G2 phase, and M phase. Each phase has a specific role in preparing the cell for division.
S Phase (Synthesis phase) is the part of the cell cycle in which DNA replication takes place. During this phase, each chromosome is duplicated to ensure that the two daughter cells will each receive an identical set of chromosomes.
Other phases:
- G1 Phase is a period of cell growth before DNA synthesis begins. The cell increases in size and synthesizes proteins and organelles.
- G2 Phase is the period after DNA synthesis where the cell continues to grow and prepares for mitosis. This phase involves the production of proteins and organelles and further cell growth.
- M Phase (Mitosis) is the phase where cell division occurs. It involves the distribution of identical sets of chromosomes into two daughter nuclei.
Hence, in eukaryotes, DNA replication takes place during the S phase.
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Concepts Used:
Cell Cycle
The sequence of growth and division of a cell, and consists of a series of biological processes, particularly the resting phase (G0), the interphase (G1, S, G2), and cell division (i.e. mitosis and cytokinesis)