What is the correct order of the stages of the cell cycle?
A.
G1,S,G2,M
B.
G2,S,G1,M
C.
M,S,G2,G1
D.
S,M,G1,G1
The correct answer and Explanation is :
The correct order of the stages of the cell cycle is:
A. G1, S, G2, M
Here’s a detailed explanation of each stage:
- G1 Phase (Gap 1): This is the first phase of the cell cycle. During G1, the cell grows in size, produces RNA, and synthesizes proteins necessary for DNA replication. The cell also performs its normal functions and prepares for DNA synthesis. This phase is crucial as it ensures the cell is ready for the subsequent DNA replication.
- S Phase (Synthesis): In the S phase, the cell duplicates its DNA. Each chromosome is replicated to produce two sister chromatids, which are connected at the centromere. This ensures that when the cell divides, each daughter cell will receive an identical copy of the genetic material.
- G2 Phase (Gap 2): Following DNA replication, the cell enters the G2 phase. During this phase, the cell continues to grow and produce proteins while also checking and repairing any errors in the newly synthesized DNA. The cell prepares for mitosis by organizing microtubules and ensuring all the necessary components are in place.
- M Phase (Mitosis): The M phase is where cell division occurs. Mitosis is the process by which the cell’s chromosomes are equally divided between two daughter cells. This phase is followed by cytokinesis, which divides the cytoplasm and other organelles into two daughter cells. Mitosis consists of several stages: prophase, metaphase, anaphase, and telophase.
After mitosis, the cell cycle returns to the G1 phase, where the process starts again. The cell cycle is a highly regulated sequence of events, ensuring accurate replication and distribution of genetic material, which is crucial for growth, development, and maintenance of healthy tissues.