The appearance of recombination nodules on homologous chromosomes during meiosis characterizes:
- Synaptonemal complex
- Bivalent
- Sites at which crossing over occurs
- Terminalization
The Correct Option is C
Solution and Explanation
During meiosis, homologous chromosomes undergo several processes to ensure genetic diversity in gametes. Among these processes is the appearance of recombination nodules, which play a crucial role in facilitating genetic exchanges between homologous chromosomes. These nodules mark specific sites where crossing over occurs. Crossing over is a critical event in meiosis that involves the exchange of genetic material between homologous chromosomes, leading to increased genetic diversity.
The options given are:
- Synaptonemal complex
- Bivalent
- Sites at which crossing over occurs
- Terminalization
Explanation of options:
- Synaptonemal complex: It is a protein structure that forms between homologous chromosomes during meiosis and is essential for stabilizing the pairing (synapsis) but does not specifically denote locations of crossing over.
- Bivalent: Refers to a pair of homologous chromosomes aligned together in meiosis, also known as tetrads, but again does not explicitly indicate crossing over points.
- Sites at which crossing over occurs: This directly describes the purpose of recombination nodules.
- Terminalization: Refers to the movement of chiasmata towards the chromosome ends during later stages of meiosis.
Conclusion: Recombination nodules are specifically associated with the sites at which crossing over occurs during meiosis. This is their defining characteristic, making this option the correct answer.
Top Questions on cell cycle and cell division
- Choose the correct statements among the following:
1. Duplication of genome, synthesis of other cell constituents, and division to produce new cells is called cell cycle.
2. Interphase is followed by a resting phase.
3. In every cell division, genetic variability will increase from generation to generation.
4. Plant cells can divide mitotically in both haploid and diploid cells.
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A) Formation of synaptonemal complex
B) Repulsion between Homologous chromosomes
C) Formation of Bivalents
D) Exchange of Genetic material between non-sister chromatids of Homologous chromosomes
E) Terminalization
The correct sequence is
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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