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What are the five main phases of the cell cycle and explain what occurs during each phase?
The 4 phases of a typical cell cycle and the events occurring during each phase are outlined:
1. Mitotic phase (or) M phase:
This is the initial stage when cells prepare for and then undergo the process of cytokinesis. M phase is simply termed as 'mitosis' also. During mitosis the chromosomes are paired and then divided prior to cell division. The events in this stage of the cell cycle leading to cell division are prophase, metaphase, anaphase and telophase. All these four stages have their own significance.
2. G1phase:
This stage corresponds to the gap in the cell cycle which follows cytokinesis. During this phase, the cells make a decision to either exit the cell cycle or become dormant or terminally differentiated or to continue dividing.
Terminal differentiation is identified as a non-dividing state for a cell. Dormant and terminally differentiated cells are identified as being in G0phase. Cells in G0 can remain in this state for extended periods of time without division.
Specific stimuli may induce the G0 cell to re-enter the cell cycle at the G1 phase or alternatively may induce permanent terminal differentiation.
During G1 phase, cells begin synthesizing all the cellular components needed in order to generate two identically complimented daughter cells. As a result the size of cells begins to increase during G1.
3. S phase:
This is an important stage of the cell cycle during which the DNA is replicated. This is the DNA synthesis phase. Additionally, some specialized proteins like histones are also synthesized during S phase.
4. G2 phase: This is the final stage after the completion of DNA replication.
During G2 phase,
i. Chromosomes begin to condense
ii. Nucleoli disappear
iii. Spindle pores are produced.
Typical eukaryotic cell cycles take up approximately 16 - 24 hrs when grown in culture. However, in the context of the multicellular organization of organisms the cell cycles can be as short as 6 - 8 hrs to as much greater as 100 days.
The G1 phase of the cycle leads to this high variability of cell cycle durations. Source: www.examville.com
What else can I help you with?
DNA replication occurs during which stage of the cell cycle?
DNA replication occurs during the S phase of the cell cycle. This is when the DNA in the cell is duplicated to produce two identical copies.
When during a cell cycle does Replication occur?
The stage of the cell cycle, replication occurs is meosis The stage of the cell cycle, replication occurs is meosis The stage of the cell cycle, replication occurs is meosis The stage of the cell cycle, replication occurs is meosisDNA replication occurs during the S phase of interphase.
When does DNA replication occur during the cell cycle?
DNA replication occurs during the S phase of the cell cycle.
During which phase of the cell cycle does DNA duplicate?
DNA duplication occurs during the S phase of the cell cycle.
When does DNA replication occur in the cell cycle?
DNA replication occurs during the S phase of the cell cycle.
What is trade cycle and explain the various phases of trade cycle?
la la di da
Explain the phases of the systems development life cycle?
The phases of the systems development life cycle are planning, systems analysis, systems design, development, testing, implementation, and maintenance.
During which phases of the cells cycle do such mutation occur?
inerphase
What happens during each of the four phases of the menstrual cycle?
u bleed
When does fertilization occur during the gymnosperms life cycle?
it occurs when it occurs
How many times in the moon cycle of phases does a crescent moon occur?
A crescent moon occurs twice in the moon cycle of phases: once during the waxing phase as it transitions from new moon to first quarter, and once during the waning phase as it transitions from third quarter to new moon.
The sequence of events that occurs in a cell from one mitotic division to the next is called what?
Cell cycle and phases of nucear division
DNA replication occurs during which stage of the cell cycle?
DNA replication occurs during the S phase of the cell cycle. This is when the DNA in the cell is duplicated to produce two identical copies.
When during a cell cycle does Replication occur?
The stage of the cell cycle, replication occurs is meosis The stage of the cell cycle, replication occurs is meosis The stage of the cell cycle, replication occurs is meosis The stage of the cell cycle, replication occurs is meosisDNA replication occurs during the S phase of interphase.
What cycle phase does DNA replication take place?
During S (synthesis) phase, between the G1 and G2 phases.
When does DNA replication occur during the cell cycle?
DNA replication occurs during the S phase of the cell cycle.
During which phase of the cell cycle does DNA duplicate?
DNA duplication occurs during the S phase of the cell cycle.
