Replication of centriole occurs during
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Multiplication of cells occurs in the DNA replication phase(preparatory phase) of the cell cycle. The synthetic phase, S, is a part of the interphase of the cell cycle.
- Interphase
- Prophase
- Late prophase
- Late telophase
The Correct Option is A
Solution and Explanation
Replication of centriole occurs during G1 phase of interphase. The interphase is the longest phase of the cell cycle and is divided into three phases G1 (Growth Phase), Sn(Synthesis Phase), and G2 (Second Growth Phase). Replication of DNA, a biosynthetic activity is a characteristic of the S-phase of the interphase.
Centrioles facilitate the formation of the spindle fibers. These separate the chromosomes during cell division. The paired centrioles move towards the opposite poles of the nucleus during cell division. However, in the S-phase of the interphase, the centrioles are separate and undergo duplication to produce two pairs of centrioles.
Centriole Duplication Cycle
For the other options:
- Prophase- Centriole pairs move towards opposite poles and form astral rays.
- Late Prophase- Astral rays grow and attach themselves to the chromomere.
- Late Telophase- Chromatids from both sides reach the opposite poles.
Also Read: Stages of Meiosis
Top Questions on cell cycle and cell division
- Given below are two statements:
Statement I : Chromosomes become gradually visible under light microscope during leptotene stage.
Statement II : The begining of diplotene stage is recognized by dissolution of synaptonemal complex.
In the light of the above statements, choose the correct answer from the options given below:- NEET (UG) - 2024
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List - I List – II A. Cells are metabolically active and proliferate i. \(G_2 phase\) B. DNA replication takes place ii. \(G_1 phase\) C. Proteins are synthesised iii. \(G_0 phase\) D. Quiescent stage with metabolically active cells iv. S phase - NEET (UG) - 2024
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- Following are the stages of cell division :
A. Gap 2 phase
B. Cytokinesis
C. Synthesis phase
D. Karyokinesis
E. Gap 1 phase
Choose the correct sequence of stages from the options given below- NEET (UG) - 2024
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List - I List – II A. Chiasmata formation i. Pachytene B. Crossing over ii. Diakinesis C. Synaptonemal complex formation iii. Diplotene D. Terminalisation of chiasmata iv. Zygotene - NEET (UG) - 2024
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- Spindle fibers attach to kinetochores of chromosomes during
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- cell cycle and cell division
Concepts Used:
Cell Cycle and Cell Division
Cell Cycle:
The sequence of events by which a cell copies itself synthesizes other constituents of the cell and eventually splits into two daughter cells is termed the cell cycle. The cell synthesizes all its constituents in a sequential pattern to make sure the proper division and distribution of components that occurs between the two daughter cells. Therefore, we can say that the cell cycle is the period of time between the development of new daughter cells and their further division.
Stages of Cell Cycle:
The cell cycle can be sub-divided into an additional category of Interphase. Meanwhile, the Interphase can be branched into 3 further stages, such as:
- G1 Phase - “Gap 1 Phase”
- S Phase - "Synthesis Phase"
- G2 Phase - "Gap 2 Phase"
Read More: Cell Cycle and Cell Division
Cell Division:
The division of the parent cells into two or more cells is called daughter cell, cell division takes place. In general, it occurs as a part of a larger cell cycle. All the cell reproduces by dividing into two, wherein each parental cell produces two daughter cells.
Stages of Cell Division:
Cell division can be widely divided into several sub-segments that result from Mitosis and Meiosis.
- Mitosis or (M Phase)
- Meiosis